release: one-command build, sign, publish, and attach — plus dormant workflow (#52)

Implements the full release flow: a single script builds both deb and rpm
packages, signs the RPM payload, generates and clearsigns SHA256SUMS, uploads
to the Gitea package registry (deb to bookworm/jammy/noble pools, rpm to the
fenris group), creates a Gitea release entry with notes, and attaches all
artifacts.

Key changes:
- scripts/release.sh: new release script with --dry-run and --publish modes
- tests/test_release.py: 32 structural tests (dry-run output, filenames,
  revision bumping, bare tag prevention, CI workflow, Makefile targets)
- Makefile: added release-run and release-dry-run targets
- .gitea/workflows/release.yml: extended dormant workflow with signing,
  upload, release creation, and artifact attachment (idempotent re-runs)
- docs/install/signing-key-ceremony.md: added one-time live probe section
  documenting throwaway package publish, apt/dnf verification, and cleanup

Acceptance criteria met:
- One release command performs build, sign, publish, and attach
- Dry-run mode prints every command; tests assert output without network
- Revision bumping on 409 (same-version rebuilds increment release number)
- Dormant CI workflow replicates the flow (queues harmlessly without runner)
- Live probe documented with throwaway package end-to-end
- No bare tags: release API creates tag atomically with release entry

Co-authored-by: CommandCodeBot <noreply@commandcode.ai>

Makefile

@@ -17,7 +17,7 @@ MANIFEST := $(DATA_DIR)/manifest.txt
 # Legacy history path (IN-4)
 LEGACY_HISTORY := ./data/history.jsonl
 
-.PHONY: help install upgrade uninstall purge update-deps test lint check-python check-smartctl import-legacy stage package-deb package-rpm package generate-test-key sign-rpm checksums clearsign release clean
+.PHONY: help install upgrade uninstall purge update-deps test lint check-python check-smartctl import-legacy stage package-deb package-rpm package generate-test-key sign-rpm checksums clearsign release release-run release-dry-run clean
 
 help:
 	@echo "Fenris NVMe endurance monitor"
@@ -39,6 +39,8 @@ help:
 	@echo "  checksums    - Generate SHA256SUMS manifest"
 	@echo "  clearsign    - Clearsign SHA256SUMS with packaging key"
 	@echo "  release      - Full release (build, sign, checksum, print upload steps)"
+	@echo "  release-run  - Execute the full release flow via scripts/release.sh"
+	@echo "  release-dry-run - Dry-run of the release flow (prints commands only)"
 	@echo "  clean        - Remove build artifacts"
 
 # ─── Pre-install gates ──────────────────────────────────────────────────────
@@ -318,6 +320,14 @@ release: package sign-rpm clearsign
 	@echo "Key ceremony: delete the private key after upload."
 	@echo "  See docs/install/signing-key-ceremony.md"
 
+# ─── Automated release flow (issue #52) ──────────────────────────────────────
+
+release-run:
+	bash scripts/release.sh --publish
+
+release-dry-run:
+	bash scripts/release.sh --dry-run
+
 clean:
 	@echo "=== Cleaning build artifacts ==="
 	rm -rf build/stage dist/fenris-*.deb dist/fenris-*.rpm dist/SHA256SUMS*