ruff (#169)

* polish: streamline nav, extract inline styles, improve tablet UX

- Restructure desktop nav from 8+ flat links + overflow dropdown into
  5 grouped dropdowns (Core, Agents, Intel, System, More) matching
  the mobile menu structure to reduce decision fatigue
- Extract all inline styles from mission_control.html and base.html
  notification elements into mission-control.css with semantic classes
- Replace JS-built innerHTML with secure DOM construction in
  notification loader and chat history
- Add CONNECTING state to connection indicator (amber) instead of
  showing OFFLINE before WebSocket connects
- Add tablet breakpoint (1024px) with larger touch targets for
  Apple Pencil / stylus use and safe-area padding for iPad toolbar
- Add active-link highlighting in desktop dropdown menus
- Rename "Mission Control" page title to "System Overview" to
  disambiguate from the chat home page
- Add "Home — Timmy Time" page title to index.html

https://claude.ai/code/session_015uPUoKyYa8M2UAcyk5Gt6h

* fix(security): move auth-gate credentials to environment variables

Hardcoded username, password, and HMAC secret in auth-gate.py replaced
with os.environ lookups. Startup now refuses to run if any variable is
unset. Added AUTH_GATE_SECRET/USER/PASS to .env.example.

https://claude.ai/code/session_015uPUoKyYa8M2UAcyk5Gt6h

* refactor(tooling): migrate from black+isort+bandit to ruff

Replace three separate linting/formatting tools with a single ruff
invocation. Updates tox.ini (lint, format, pre-push, pre-commit envs),
.pre-commit-config.yaml, and CI workflow. Fixes all ruff errors
including unused imports, missing raise-from, and undefined names.
Ruff config maps existing bandit skips to equivalent S-rules.

https://claude.ai/code/session_015uPUoKyYa8M2UAcyk5Gt6h

---------

Co-authored-by: Claude <noreply@anthropic.com>

tests/integrations/test_paperclip_task_runner.py

@@ -116,9 +116,10 @@ def bridge(mock_client):
 @pytest.fixture
 def settings_patch():
     """Patch settings for all task runner tests."""
-    with patch("integrations.paperclip.task_runner.settings") as ts, patch(
-        "integrations.paperclip.bridge.settings"
-    ) as bs:
+    with (
+        patch("integrations.paperclip.task_runner.settings") as ts,
+        patch("integrations.paperclip.bridge.settings") as bs,
+    ):
         for s in (ts, bs):
             s.paperclip_enabled = True
             s.paperclip_agent_id = TIMMY_AGENT_ID
@@ -185,7 +186,7 @@ class TestOrchestratorWiring:
         issue = _make_issue()
 
         runner = TaskRunner(bridge=bridge, orchestrator=stub_orchestrator)
-        result = await runner.process_task(issue)
+        await runner.process_task(issue)
 
         assert len(stub_orchestrator.calls) == 1
         call = stub_orchestrator.calls[0]