Merge origin/main into main

Reconcile the staged-projection and Diagnostics feature work with the CI
quality-gate changes from origin/main. The origin side of every conflict was
lint-only, so the feature imports were kept and the ruff fixes re-applied:

- keep the branch's added imports (timefmt, activity_readout, projection
  ladder helpers) and drop the unused ones ruff reported
- restore `noqa: E402` on the post-bootstrap imports in fenris-monitor and
  keep the `noqa: F401` re-exports in the TUI that tests assert on
- make the TUI monitoring-glyph test clock-relative instead of pinned to a
  fixed date

tests/test_issue_72_edge_cases.py

@@ -7,11 +7,9 @@ Covers:
 - TPH-#63: Horizon anchoring at evidence endpoint
 - TPH-#64: Burst/habit checks with unknown daily shares
 """
-import sqlite3
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
 
-import pytest
 import sys
 sys.path.insert(0, str(Path(__file__).parent.parent / "src"))
 
@@ -19,8 +17,8 @@ from fenris.store import init_store
 from fenris.monitoring_periods import ensure_period_open, close_period
 from fenris.derive import derive_hours_from_interval
 from fenris.day_aggregate import derive_day
-from fenris.projection import compute_projection, ConfidenceState, STALENESS_HOURS
-from fenris.activity_readout import _query_live_graph_data, _query_daily_graph_data
+from fenris.projection import compute_projection
+from fenris.activity_readout import _query_live_graph_data
 
 
 # ---------------------------------------------------------------------------