xavierk
e12f4a574c
- Change default collection cadence from 5 minutes to 3 minutes (CADENCE_DEFAULT_S=180, systemd OnUnitInactiveSec=3min, runit CADENCE=180) - Update freshness threshold to 450s (2×180 + AccuracySec + 60) - Add _query_live_graph_data(): queries raw samples from the last 3 hours and computes interval byte deltas with actual timestamps - Add LiveActivityGraph widget: vertical bar chart of interval volumes with read/write toggle (w key), arrow key inspection, and click support - Wire live graph into TUI layout (full-width row between daily graph and drive health), refresh cycle, and CSS grid - Replace t theme binding with t today/live binding; theme selection via preferences file - Add w binding for read/write toggle on live graph - Update action legend, help screen, and grid layout for new live-activity row - Add 20 tests covering cadence constants, live query, widget rendering, toggle, and TUI integration - Update all cadence documentation (README, ADR 0003, acceptance criteria LC-2, fenris-redesign constants table, CHANGELOG)
147 lines
26 KiB
Markdown
147 lines
26 KiB
Markdown
# Acceptance criteria: the Fenris redesign
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Status: Accepted — resolves [Define cross-cutting acceptance criteria](https://git.bongbetic.com/xavierk/Fenris/issues/13) on the [Wayfinder map](https://git.bongbetic.com/xavierk/Fenris/issues/1). These criteria are the accepted definition of done for the finished redesign; the implementation-ready specification assembles them with ADRs 0001–0006 at handoff.
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## Framework
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- **Canonical term**: *acceptance criterion* — one testable behavioral statement. "Behavioral gate" is avoided as a synonym. Wording follows the repository glossary (`CONTEXT.md`).
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- **Evidence classes** — every criterion carries exactly one:
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- **A** — automated test (unit/integration, fixture-driven).
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- **P** — scripted system probe on a host with systemd, polkit, and the configured NVMe device.
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- **M** — manual checklist, reserved for interactions a fixture cannot capture (live polkit agent prompts, TUI keyboard feel).
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- Whatever can be automated must be; **M** only where automation cannot reach.
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- **Traceability-only**: every number and behavior cites the ADR or ticket that fixed it. Nothing undecided enters here; new demands become new tickets, never criteria.
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- **Organization**: criteria are grouped by subsystem, with cross-cutting invariants spanning them. Coverage spans all decided areas — observation store and migration, collector lifecycle and privileges, projection and confidence, controller identity, the Panes TUI, failure paths, and installation lifecycle.
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- **Placeholders**: none remain. SLOT-B was filled by [Choose the collector's NVMe acquisition path](https://git.bongbetic.com/xavierk/Fenris/issues/16) as AC-1–AC-5; SLOT-A was filled by [Decide how degraded identity affects projection confidence](https://git.bongbetic.com/xavierk/Fenris/issues/15) as PR-15, PR-16, and ID-4.
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- **Test-plan boundary**: Given/When/Then test specs are derived by the implementer at implementation time. This effort produces criteria only.
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## Cross-cutting invariants
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- **CI-1** (A; ADR 0002 §§6–8, ADR 0003 §10) *Exhaustive state matrix*: from a synthetic observation store, the TUI and `fenris status` render every realizable combination of confidence state (Unavailable, Limited, Supported) × freshness grade (fresh, missed, stale, empty store) × endurance-baseline tier (verified override, unverified override, implied, none) exactly as the ADR 0002 rule table and ADR 0003 freshness constants dictate — headline number present only when the rules allow it, contributing facts always, never a percentage.
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- **CI-2** (P/A; ADR 0003 §§4–9) *TUI/CLI parity*: every TUI action has a CLI twin — pause (`fenris monitor pause`), resume (`fenris monitor resume`), collect-now (`fenris sample`), baseline set/clear, and the status fact set — with identical outcomes and wording.
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- **CI-3** *Prohibition set* (A = test, P = probe; each cites its clause):
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- No code path outside `fenris-collect` interrogates the device (ADR 0003 §7).
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- No `/run/fenris` coordination surface or export layer exists anywhere; state lives in the observation store and coordination in systemd (ADR 0003 §1, ADR 0001 §2).
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- Polkit authorizes exactly one binary, `fenris-monitor`, under `com.bongbetic.fenris.monitor` `auth_admin` (ADR 0003 §5, ADR 0004 §3).
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- No absent hour is ever interpolated, estimated, or fabricated (ADR 0005 §2).
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- No alerting, notification, or escalation machinery exists anywhere (ADR 0005 §§5–6).
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- `/etc/fenris/fenris.conf` holds exactly one key — the device selector (ADR 0003 §3).
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- No synthetic or capacity-derived baseline is ever created, including for legacy history (ADR 0002, Consequences).
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- Readers never partially interpret a newer-schema store (ADR 0001 §8, ADR 0005 §4).
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- Projections are never stored; always recomputed on read (ADR 0001 §3, ADR 0002 §13).
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- **CI-4** (A; ADR 0002 §§11–12) *User-facing language*: TUI and status render the endurance research's required wording and six disclosures as adopted; zero-rate and unavailable cases use their exact phrasing; the scenario range is the only spread shown anywhere.
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## Observation store and legacy migration (ADR 0001)
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- **ST-1** (P) One SQLite database in WAL mode at `/var/lib/fenris/observations.db`, root-owned and group-readable through the `fenris` read group; the TUI opens it read-only.
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- **ST-2** (A) An unprivileged reader querying during a collector write sees a consistent snapshot.
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- **ST-3** (A) The schema carries `samples`, `hour_observations`, `day_aggregates`, `monitoring_periods`, `controller_segments`, and `endurance_baseline` with the ADR 0001 column sets as amended by [Define endurance-baseline provenance and validation](https://git.bongbetic.com/xavierk/Fenris/issues/12) and [Decide controller-segment metadata columns](https://git.bongbetic.com/xavierk/Fenris/issues/14).
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- **ST-4** (A) Hours and days are UTC-bounded; day derivation from hours is monotonic; no 23- or 25-hour days exist.
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- **ST-5** (A) Raw samples are pruned opportunistically to 14 days; hour observations and day aggregates are retained indefinitely.
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- **ST-6** (P) Legacy import is one transaction: a scripted kill mid-import leaves the store fully pre- or fully post-migration.
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- **ST-7** (A) Import is idempotent: a second run no-ops on the legacy-import marker.
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- **ST-8** (A) Legacy files are renamed `*.migrated` only after commit and never deleted.
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- **ST-9** (A) Malformed legacy lines are quarantined with a logged count, never silently dropped.
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- **ST-10** (A) `hourly.jsonl` is never trusted: mismatches against derived data are diffed and logged.
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- **ST-11** (A) Migration opens one implicit monitoring period at the first legacy sample, closed `end_cause = migrated` at the migration moment; pre-migration hours carry an unknown activity split except directly evidenced facts.
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- **ST-12** (A) Schema versioning: `PRAGMA user_version` with ordered, per-step transactional migrations; the collector refuses an unknown newer version.
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## Collector lifecycle and privilege boundaries (ADR 0003)
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- **LC-1** (P) Exactly two system units exist — `fenris-collect.timer` (`timers.target`) and `fenris-collect.service` (`Type=oneshot`, root, `ExecStart=/usr/libexec/fenris/fenris-collect`); the TUI and CLI are ordinary unprivileged processes and never units.
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- **LC-2** (P) Timer defaults ship as `OnBootSec=2min`, `OnUnitInactiveSec=3min`, `AccuracySec=30s`, `Persistent=no`, `TimeoutStartSec=90s`; cadence changes are documented drop-ins and no interval key exists in configuration.
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- **LC-3** (P) A hung device interrogation fails visibly within `TimeoutStartSec=90s` as a bounded failed run retried next interval.
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- **LC-4** (A/P) `/etc/fenris/fenris.conf` holds exactly the device selector (stable `/dev/disk/by-id/…` path; raw nodes warned), re-read every run; an invalid selector is a bounded failed run surfaced as `configuration error: <reason>` in `status` and the TUI.
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- **LC-5** (P) Two privileged binaries ship at `/usr/libexec/fenris/fenris-collect` and `/usr/libexec/fenris/fenris-monitor`; the unprivileged `fenris` wrapper opens the TUI with no arguments.
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- **LC-6** (P+M) Pause = `fenris-monitor disable --now` asks for confirmation; Resume = `enable --now` does not; both perform the systemctl operation and period bookkeeping in one step under polkit `com.bongbetic.fenris.monitor` (`auth_admin`), failing cleanly with the printed root equivalent where no polkit agent exists. (M covers the live agent prompt.)
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- **LC-7** (A) The period-row idempotent matrix of ADR 0003 §6 holds exactly: first-ever enable opens; resume with an open period changes nothing; resume without one opens anew; pause with an open period closes `user_disabled`; pause otherwise no-ops; a raw systemctl stop/disable never records `user_disabled`.
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- **LC-8** (P) `fenris sample` and the TUI's collect-now route through `fenris-monitor` → `systemctl start fenris-collect.service`, block until exit, and report the outcome (freshness line or journal hint) synchronously; the TUI never samples in-process.
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- **LC-9** (A/P) CLI compatibility: `status` is a read-only composition (projection facts, enabled/active, last collect outcome, `journalctl` hint on failure or staleness) that never auto-samples and never prompts; `sample` is retained via the helper; `--device` is rejected with a pointer to the configuration file; `start`, `stop`, and `run` are rejected with one-line migration pointers; `fenris.sh` is not shipped and is removed from the repository; the README maps its five menu options to successors.
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- **LC-10** (A) Freshness constants are defined once and shared by TUI and CLI: fresh = newest sample within 2× cadence + `AccuracySec` + 60 s; missed between that and 48 h; stale ≥ 48 h; an empty store reads "no observations yet" with an enable hint; freshness derives from the newest sample timestamp, never a stored health flag.
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## Projection contract and confidence (ADR 0002)
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- **PR-1** (A) Exactly one projection, from the precedence-chosen baseline (verified override → unverified override → implied → unavailable); Percentage Used renders as a vendor-wear context line, with a note when it disagrees with the observed write rate by more than a factor of 2; the PU-slope regression and `capacity × 600` synthesis are gone.
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- **PR-2** (A) The headline rate is the sustained-regime rate (regime DUW bytes ÷ in-period wall-clock seconds), default regime = full history capped at 90 days; the 7/28/90-day scenario range is computed independently and shows only covered horizons, with no placeholders.
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- **PR-3** (A) Habit change: trailing 7-day mean ≥ 2× or ≤ 0.5× the preceding 28-day mean for 3 consecutive days starts a new regime at the first divergence day, adopted automatically and labeled "usage habit changed N days ago"; a regime younger than 7 days caps confidence at Limited evidence.
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- **PR-4** (A) Hour classification uses the named constants: powered-off below 90% of power-on-hours span; active at ≥ 256 MiB DUW; idle below it while powered on and sampled; unknown otherwise; disabled time is wall-clock outside monitoring periods, never an hour state.
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- **PR-5** (A) The denominator is wall-clock seconds inside monitoring periods including powered-off and unknown time; disabled periods are excluded from numerator and denominator; unexplained gaps keep the aggregate counter delta, remain as unknown seconds, and reduce coverage.
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- **PR-6** (A) Warming up until 14 distinct UTC day aggregates of which at most 2 fall below 50% coverage; the projection still renders with its facts while warming; every Unavailable condition renders no lifespan number.
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- **PR-7** (A) A newest day aggregate older than 48 h drops confidence one level and is shown as a contributing fact.
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- **PR-8** (A) The confidence rule table of ADR 0002 §8 holds verbatim, rendering state plus contributing facts and never a percentage.
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- **PR-9** (A) Segment breaks: a DUW decrease with unchanged identity keeps prior day aggregates as habit evidence with the projection Unavailable until re-warm; a controller-identity change quarantines prior history from projection entirely.
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- **PR-10** (A) The implied baseline is eligible only after ≥ 2 Percentage-Used increments within the current controller segment; until then, Unavailable with "vendor wear estimate too coarse to imply endurance".
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- **PR-11** (A) Zero rate renders "no finite projection from this history" — never infinity or zero; no statistical confidence interval appears anywhere.
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- **PR-12** (A) The projection contract hands the TUI exactly: confidence state, contributing facts, headline remaining time when one exists, scenario range, Percentage-Used context line, disclosure text — recomputed on read, never stored.
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- **PR-13** (A) Baseline provenance and validation per [Define endurance-baseline provenance and validation](https://git.bongbetic.com/xavierk/Fenris/issues/12): mandatory provenance (URL, revision, entry date, model, nominal capacity); one active row replaced on edit; verification derived at read (machine match or recorded attestation), never a stored boolean; incomplete provenance stores only behind explicit acknowledgment as the unverified tier; entry-time unprivileged sysfs validation (normalized model containment; capacity within ±1%; interactive confirm recorded as `validated_by = user`); read-time applicability is a model match against the current controller segment, with a mismatch retained — never auto-deleted — leaving the projection Unavailable.
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- **PR-14** (P) `baseline set` / `baseline clear` persist through the polkit-guarded `fenris-monitor` verb after CLI-side validation.
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- **PR-15** (A) An identity-degraded controller segment (blank identity key — every rung of the key ladder empty) caps projection confidence at Limited evidence, with the contributing fact "controller identity unavailable — replacement detection relies on write-counter continuity only" rendered in every state; the cap combines idempotently with the 48-hour staleness drop, and ephemeral markers (model "Linux", non-pcie transport) never render as confidence facts ([Decide how degraded identity affects projection confidence](https://git.bongbetic.com/xavierk/Fenris/issues/15); ADR 0002 §§8–9 as amended).
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- **PR-16** (A) Identity-change semantics extend to blank keys verbatim: any visible change of the recorded identity key — including to or from a blank key — quarantines prior history from projection as a controller-identity change, while equal blank keys continue the segment segmented by DUW monotonicity alone (ADR 0002 §9 as amended).
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- **PR-17** (A) Projection arithmetic is exactly `E_rated = entered_TBW × 10¹²` bytes, `E_implied = 100 · W_t / p` computed only for `1 ≤ p ≤ 254` (Percentage Used of 0 or saturated 255 implies no baseline — that precedence tier is unavailable), and `projected = max(E_baseline − W_t, 0) / rate` for `rate > 0` (ADR 0002 §2).
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## Controller identity ([Verify the controller identity that segments observation history](https://git.bongbetic.com/xavierk/Fenris/issues/11), [Decide controller-segment metadata columns](https://git.bongbetic.com/xavierk/Fenris/issues/14); ADR 0001 §3 as amended)
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- **ID-1** (A) The controller-segment identity key is the normalized kernel-exposed subsystem NQN, with the kernel composite then model|serial as fallbacks; FR is metadata only; identity change and DUW decrease act as independent axes.
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- **ID-2** (A) Segments freeze a fully nullable metadata snapshot at open — normalized `subnqn`/`sn`/`mn`/`fr` plus `vid`/`ssvid`/`transport` and `identity_degraded` — immutable thereafter, with `cntlid` excluded.
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- **ID-3** (A) Legacy history imports under a labeled model-scoped legacy identity (mn-only segments).
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- **ID-4** (A) `identity_degraded` is set at segment open exactly when the identity key is blank; keys from the kernel-composite or `model|serial` rungs are not degraded ([Decide how degraded identity affects projection confidence](https://git.bongbetic.com/xavierk/Fenris/issues/15)).
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## Panes TUI ([Prototype the TUI information architecture](https://git.bongbetic.com/xavierk/Fenris/issues/3), [Evaluate Python TUI frameworks](https://git.bongbetic.com/xavierk/Fenris/issues/6); ADR 0003 §§8, 10; ADR 0004 §10)
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- **TUI-1** (A) Variant A "Panes": one dense keyboard-first screen; confidence rendered as evidence (state + contributing facts); boot enablement, runtime activity, last collect outcome, and freshness displayed as four separate facts.
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- **TUI-2** (M) Pause/resume asymmetry and polkit tty passthrough work in a live terminal: pause confirms, resume does not, and the platform agent prompts without breaking the TUI.
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- **TUI-3** (P) Textual runs on Python 3.9+, gated at install time, never a runtime crash.
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- **TUI-4** (A) The Panes screen layout is normative: a full-width headline band (lifespan headline or its no-projection wording, confidence state with contributing facts, scenario range); a usage-history pane on the left (write-history sparkline with ▲ habit-change and ? unexplained-gap markers plus legend, habit-split bar with active/idle/powered-off/unknown shares); a drive-health and settings pane on the right (health facts, vendor-wear context line, read-only settings with the endurance baseline and its provenance label); a full-width service strip at the bottom (the four separate service facts, the monitoring-period line, the action legend). Production bindings are the footer `p pause · r resume · c collect · d disclosures` — pause asks, resume does not — plus a bordered quit rail `q QUIT TUI` visually separate from monitoring state; the rail owns quit and the footer carries no quit entry (bindings amended by [Lock the dashboard wording strings](https://git.bongbetic.com/xavierk/Fenris/issues/57); original [Prototype the TUI information architecture](https://git.bongbetic.com/xavierk/Fenris/issues/3)); the prototype branch is visual reference only.
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## Failure and recovery (ADR 0005)
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- **FL-1** (A) The collector validates every row against the store invariants (hour seconds sum to 3600; non-negative DUW delta within a controller segment; coverage consistent with sample count); a violating run writes nothing, logs the refused row, and fails visibly.
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- **FL-2** (A) Readers defensively exclude and count malformed rows as a contributing fact.
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- **FL-3** (A) No backfill ever: gaps remain unknown seconds; degradation flows only through coverage, freshness facts, and confidence categories.
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- **FL-4** (P/A) A store fault surfaces "observation store unreadable" with a journal hint and suppresses everything else store-dependent; the collector treats it as a bounded failed run and never recreates or overwrites the file; recovery is the documented human-sanctioned move-aside (with `history.jsonl` re-import if the legacy import never completed); no built-in destructive command exists.
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- **FL-5** (A) A newer-schema store renders "observation store written by a newer Fenris — upgrade Fenris" in TUI and status, with no partial interpretation.
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- **FL-6** (A/P) Repeated collector failures retry at flat cadence with no backoff or notification; persistence reads as stale exactly like any other gap.
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- **FL-7** (A) `critical_warning`, media errors, and unsafe shutdowns render as ordinary facts in TUI and status and never affect the projection.
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- **FL-8** (A) A collection run finding no open monitoring period opens one at the run moment, never backdated.
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## Installation, upgrade, and removal (ADR 0004)
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- **IN-1** (P) `sudo make install` builds a wheel from the checkout and installs pinned dependencies into the dedicated venv at `/opt/fenris`, with a `/usr/local/bin/fenris` wrapper; after install nothing references the checkout.
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- **IN-2** (P) The installer records every placed file in an explicit manifest consumed by upgrade and uninstall.
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- **IN-3** (P) The installer never enables or starts units: a fresh install is dormant (units disabled, nothing running, no monitoring period); the only opt-in is the sanctioned toggle — `fenris monitor resume [--now]` or the first-run TUI prompt — enabling the timer and opening the first period in one step.
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- **IN-4** (P) Install-time legacy import detects `./data/history.jsonl` (or an explicit path), runs the idempotent single-transaction import, and reports imported counts; `fenris import <path>` remains available.
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- **IN-5** (P) `sudo make upgrade` installs into the same venv, syncs units and polkit against the manifest (`daemon-reload`; timer restarted only if unit contents changed and it is active), never kills an in-flight collection run, then applies forward-only schema migrations; `/var/lib/fenris` is never rebuilt.
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- **IN-6** (P) Before migrations, `observations.db` is snapshotted to a one-generation `.bak`; rollback is reinstall-previous plus restore; automatic schema downgrade does not exist.
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- **IN-7** (P) `make uninstall` performs the sanctioned disable first (open period closes `user_disabled`), then removes venv, helpers, units, polkit policy, and wrapper while keeping `/etc/fenris` and the observation store; `make purge` additionally removes configuration and store.
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- **IN-8** (P) Dependencies are exact pins in a committed lockfile installed by both install and upgrade; refreshing pins is an explicit `make update-deps` step, never an install side effect.
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- **IN-9** (P) The installer verifies `python3 ≥ 3.9` and fails cleanly otherwise; `/var/lib/fenris` is created with root-written group-read permissions; the database file is created lazily by the first write.
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- **IN-10** (P) Installed artifacts sit only at their fixed locations — units in `/etc/systemd/system`, helpers in `/usr/libexec/fenris`, polkit policy under `/usr/share/polkit-1/actions/`, configuration at `/etc/fenris`, observation store under `/var/lib/fenris` — and every placed file is recorded in the manifest (ADR 0004 §2; ADR 0003 §4).
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## Migration from make-install systems (ADR 0007 §10, spec §9)
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- **MG-1** (M) The migration runbook is published in the install docs (`docs/install/migrate-from-makeinstall.md`): mandatory remove-then-install steps, why over-install is forbidden (stale admin-directory units silently shadow vendor units; the local wrapper shadows the package wrapper), no-move continuity, and the reset-to-dormant expectation (the user opts back in with the sanctioned resume).
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- **MG-2** (A) The install guard is verified across the matrix: either make-install marker (the legacy placement manifest, or a unit file under the admin unit directory) causes an abort with a runbook pointer — never auto-clean. Tested by `test_migration_guard` on all four targets (Debian 12, Ubuntu 22.04, Ubuntu 24.04, Fedora 40).
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- **MG-3** (A) No-move continuity is verified in a container seeded with a make-install-shaped system: existing group makes sysusers a no-op, existing store directory makes tmpfiles a no-op, the hand-written configuration survives as a non-database file (package default lands beside it), and the store schema is caught up by the upgrade-path migration. Tested by `test_no_move_continuity_deb` and `test_no_move_continuity_rpm`.
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- **MG-4** (M) The migration costs at most one short sample gap, honestly recorded in the endurance timeline: `make uninstall`'s sanctioned disable closes the open period `user_disabled`; after migration the user opts back in with `fenris monitor resume`.
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## Collector acquisition path (ADR 0006)
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- **AC-1** (P) Each collection run acquires counters and thermal evidence solely from `smartctl -a -j <device>` and controller identity (`subnqn`, `sn`, `mn`, `fr`, `transport`) solely from sysfs; no other acquisition path exists anywhere in the codebase.
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- **AC-2** (A) Identity normalization is applied exactly once, at write time — trailing spaces and newlines stripped, no case folding, empty-after-strip stored blank — so padded and unpadded renderings of the same field yield byte-identical stored values.
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- **AC-3** (A) Any acquisition failure — missing binary, nonzero exit, malformed JSON, unreadable sysfs attribute — fails the whole collection run; no partial sample (identity without counters, or counters without identity) is ever written; the miss surfaces through ADR 0005 freshness, never as degraded identity.
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- **AC-4** (P) `vid`/`ssvid` are read from the PCI sysfs node when present and stored null otherwise; they are segment metadata only, never key components.
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- **AC-5** (P) `make install` verifies `smartctl` and fails cleanly otherwise; the acquisition path adds no Python dependency and no OS package beyond smartmontools (ADR 0004 §9).
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## Dashboard clarity and release notes ([Chart Fenris dashboard clarity](https://git.bongbetic.com/xavierk/Fenris/issues/55))
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Decided in [Write the dashboard clarity acceptance criteria](https://git.bongbetic.com/xavierk/Fenris/issues/59), from [Prototype the dashboard clarity additions](https://git.bongbetic.com/xavierk/Fenris/issues/56), [Lock the dashboard wording strings](https://git.bongbetic.com/xavierk/Fenris/issues/57), and [Specify the changelog and release-notes mechanism](https://git.bongbetic.com/xavierk/Fenris/issues/58).
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- **DC-1** (A) TUI branding: the header bar renders `Fenris — NVMe endurance monitor`; a dimmed `by Bongbetic` sits inline with service facts in the bottom service strip; neither string appears in `fenris status` (TUI-only identity surfaces).
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- **DC-2** (A) Continuity parity, keyed to the boot fact as-is: active + boot-enabled renders `monitoring: active in background · persists across reboots`; boot-disabled renders `monitoring: does not start on next boot` — identical lowercase source strings in the TUI service strip and `fenris status`, including while paused (paused implies boot-disabled; the row still reports the fact). Test impact: feeds the CI-2 sweep (lowercase source-string comparison).
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- **DC-3** (A) Paused presentation (Deliberate disable): the TUI shows a strong state block titled `monitoring: paused — deliberate disable` with subline `paused time is excluded from your usage habit · resume: fenris monitor resume`; `fenris status` prints the same two lines with identical wording. Test impact: feeds the CI-2 sweep (lowercase source-string comparison).
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- **DC-4** (A) Quit affordance distinct from monitoring state: a bordered labelled rail `q QUIT TUI` visually separate from the paused state block; the footer reads `p pause · r resume · c collect · d disclosures` with no quit entry (the rail owns quit); quitting the TUI never alters monitoring state. Amends TUI-4's binding parenthetical.
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- **DC-5** (A) Launch auth banner: `privileged actions will prompt for authentication (polkit)` renders full-width under the header at TUI launch, clears on the first refresh tick, and never reappears in the session; no user-facing string uses "sudo" (polkit-accurate elevation wording only).
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- **DC-6** (A) CHANGELOG.md shape (Keep a Changelog 1.1): `## [Unreleased]` always present at top, even empty; version headings `## [X.Y.Z] - YYYY-MM-DD` with strict ISO date; categories Added/Changed/Fixed only, security folding into Fixed; entries are single `- ` bullets, imperative mood, user-facing, no commit hashes or issue numbers.
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- **DC-7** (A) Extraction fails closed: `scripts/extract_changelog.py` slices the requested version's section verbatim and never reads `[Unreleased]`; a missing or empty section or a malformed date produces `::error::` and a nonzero exit; the release workflow fails when the pushed tag ≠ `v{version from pyproject.toml}` (guard skipped on `workflow_dispatch`).
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- **DC-8** (A/P) Release body: the body is the extracted section verbatim plus the standing footer from `packaging/release-footer.md`; a re-run against an existing release PATCHes the body (re-sync is a feature) while uploaded assets skip idempotently. A covers assembly/PATCH-logic unit tests; P is one scripted `workflow_dispatch` verification of body assembly.
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