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_tui.py

@@ -13,29 +13,22 @@ import sqlite3
 from xml.etree import ElementTree
 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
 
 sys.path.insert(0, str(Path(__file__).parent.parent / "src"))
 
-from textual.app import App
-from textual.pilot import Pilot
 
-from fenris.store import init_store, SCHEMA_VERSION
-from fenris.monitoring_periods import ensure_period_open, close_period
+from fenris.store import init_store
+from fenris.monitoring_periods import ensure_period_open
 from fenris.projection import (
     ConfidenceState,
     compute_projection,
-    DISCLOSURES,
-    WARMING_MIN_DAYS,
-    STALENESS_HOURS,
-    YOUNG_REGIME_DAYS,
 )
 from fenris.status import (
     FRESH_THRESHOLD_S,
-    STALENESS_THRESHOLD_S,
     grade_freshness,
 )
 from fenris.activity_readout import (
@@ -47,7 +40,6 @@ from fenris.tui import (
     FenrisTuiApp,
     HistoryGraph,
     _format_remaining,
-    _RANGE_OPTIONS,
     _RANGE_DEFAULT,
     _MIN_WIDTH,
     _MIN_HEIGHT,
@@ -285,7 +277,7 @@ class TestDenseScreen:
         conn.close()
 
         app = FenrisTuiApp(store_path=tmp_path / "test.db")
-        async with app.run_test() as pilot:
+        async with app.run_test():
             assert app.query_one("#headline-band") is not None
             assert app.query_one("#usage-history") is not None
             assert app.query_one("#drive-health") is not None
@@ -305,7 +297,7 @@ class TestDenseScreen:
         conn.close()
 
         app = FenrisTuiApp(store_path=tmp_path / "test.db")
-        async with app.run_test() as pilot:
+        async with app.run_test():
             headline = str(app.query_one("#headline-band").render())
             assert "remaining" in headline.lower() or "projection" in headline.lower()
 
@@ -323,7 +315,7 @@ class TestDenseScreen:
         conn.close()
 
         app = FenrisTuiApp(store_path=tmp_path / "test.db")
-        async with app.run_test() as pilot:
+        async with app.run_test():
             headline = str(app.query_one("#headline-band").render())
             assert "projection confidence" in headline.lower()
             # Contributing facts shown, never a percentage as confidence
@@ -345,7 +337,7 @@ class TestDenseScreen:
         conn.close()
 
         app = FenrisTuiApp(store_path=tmp_path / "test.db")
-        async with app.run_test() as pilot:
+        async with app.run_test():
             strip = str(app.query_one("#service-strip").render())
             assert "Boot:" in strip
             assert "Timer:" in strip
@@ -486,7 +478,6 @@ class TestDenseScreen:
         auth_notice = "Open with fenris (no sudo). Actions authenticate via polkit. ? Help"
 
         async with app.run_test() as pilot:
-            headline = str(app.query_one("#headline-band").render())
             # Identity now shows Fenris by Bongbetic (issue #79)
             assert "Fenris by Bongbetic" in str(app.query_one("#identity").render())
             assert auth_notice in str(app.query_one("#auth-notice").render())
@@ -528,7 +519,7 @@ class TestDisclosuresAndGreeting:
     async def test_empty_store_greeting(self, tmp_path):
         """Empty store shows 'no observations yet' with enable hint."""
         app = FenrisTuiApp(store_path=tmp_path / "nonexistent.db")
-        async with app.run_test() as pilot:
+        async with app.run_test():
             headline = str(app.query_one("#headline-band").render())
             assert "no observations yet" in headline.lower()
             assert "enable" in headline.lower() or "resume" in headline.lower()
@@ -593,9 +584,8 @@ class TestFirstRun:
     async def test_first_run_prompt(self, tmp_path):
         """First-run prompt makes the keyboard action and boot effect explicit."""
         app = FenrisTuiApp(store_path=tmp_path / "nonexistent.db")
-        async with app.run_test() as pilot:
+        async with app.run_test():
             headline = str(app.query_one("#headline-band").render())
-            strip = str(app.query_one("#service-strip").render())
             assert "no observations yet" in headline.lower()
             assert "r resume — enable monitoring and future boots" in headline.lower()
             assert "r resume" in str(app.query_one("#action-rail").render()).lower()
@@ -868,7 +858,6 @@ class TestQueryHourlyGraphData:
 class TestHistoryGraph:
     def test_empty_data(self, tmp_path):
         """Empty data shows awaiting message."""
-        app = FenrisTuiApp(store_path=tmp_path / "nonexistent.db")
         # We test the widget directly via the app's compose
         graph = HistoryGraph()
         # Simulate setting empty data
@@ -1131,7 +1120,6 @@ class TestBarGraphTUI:
         app = FenrisTuiApp(store_path=tmp_path / "nonexistent.db")
         async with app.run_test(size=(80, 24)) as pilot:
             await pilot.press("v", "v")
-            graph = app.query_one("#usage-history")
             assert app.query_one("#activity-panel").border_title == "Drive activity"
 
     @pytest.mark.asyncio