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_composition.py

@@ -10,10 +10,9 @@ Covers:
   - AC78-5: Separate freshness, last outcome, boot enablement, activity facts
   - AC78-6: 5s poll reevaluates freshness from cached clock
 """
-import sqlite3
 from datetime import datetime, timedelta, timezone
 from pathlib import Path
-from unittest.mock import patch, MagicMock
+from unittest.mock import patch
 
 import pytest
 import sys
@@ -23,12 +22,9 @@ sys.path.insert(0, str(Path(__file__).parent.parent / "src"))
 from fenris.store import init_store
 from fenris.status_composition import (
     StatusState,
-    StatusComposition,
     compose_status,
     render_status_cli,
     render_status_tui,
-    FRESH_THRESHOLD_S,
-    STALENESS_THRESHOLD_S,
 )
 
 
@@ -682,7 +678,6 @@ class TestStoreFaultSuppression:
         conn.close()
 
     def test_newer_schema_suppresses_projection(self, tmp_path):
-        import fenris.store as store_mod
         conn = init_store(tmp_path / "test.db")
         now = _clock()
 
@@ -957,8 +952,7 @@ class TestTUIIntegration:
         conn = init_store(tmp_path / "test.db")
         _insert_segment(conn)
         _open_period(conn)
-        now = _clock()
-        ts = (now - timedelta(minutes=2)).isoformat()
+        ts = (datetime.now(timezone.utc) - timedelta(minutes=2)).isoformat()
         _insert_sample(conn, ts)
         for i in range(20):
             d = (datetime(2026, 9, 10) + timedelta(days=i)).strftime("%Y-%m-%d")
@@ -971,7 +965,7 @@ class TestTUIIntegration:
             "last_collect_ok": True, "last_collect_age_s": 120,
             "last_collect_reason": None,
         }):
-            async with app.run_test() as pilot:
+            async with app.run_test():
                 strip = str(app.query_one("#service-strip").render())
                 assert "●" in strip
                 assert "Monitoring" in strip or "monitoring" in strip.lower()
@@ -997,7 +991,7 @@ class TestTUIIntegration:
             "last_collect_ok": None, "last_collect_age_s": None,
             "last_collect_reason": None,
         }):
-            async with app.run_test() as pilot:
+            async with app.run_test():
                 strip = str(app.query_one("#service-strip").render())
                 # Should show Paused state
                 assert "‖" in strip or "Paused" in strip or "paused" in strip.lower()
@@ -1024,7 +1018,7 @@ class TestTUIIntegration:
             "last_collect_ok": False, "last_collect_age_s": 60,
             "last_collect_reason": "exit code 3",
         }):
-            async with app.run_test() as pilot:
+            async with app.run_test():
                 strip = str(app.query_one("#service-strip").render())
                 # Should show Error state
                 assert "✖" in strip or "Error" in strip or "error" in strip.lower()