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_status.py

@@ -11,13 +11,11 @@ Covers:
   - Retired command rejection with migration pointers
   - Configuration error surfaced from direct reads
 """
-import os
 import sqlite3
 import sys
-import tempfile
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
-from unittest.mock import patch, MagicMock
+from unittest.mock import patch
 
 import pytest
 
@@ -34,7 +32,7 @@ from fenris.status import (
     ACCURACY_SEC,
 )
 from fenris.store import init_store, SCHEMA_VERSION
-from fenris.projection import DISCLOSURES, ConfidenceState
+from fenris.projection import DISCLOSURES
 from fenris.timefmt import freshness_age_human