merge: reconcile PR 40 with current lab

Integrate lab fff55a78 into PR #40 (cc25d5ba). Lab's modular email
backend/frontend, modular settings, split stylesheets (static/style.css
stays deleted), procfs compatibility, and request-scoped TurnContract
authority win; PR #40's routing classifiers, editor/email/task features,
and style.css changes are ported into lab's module and stylesheet homes.

Integration fixes:
- settings/api.js imports ui.js under its canonical versioned URL
- browser observations keep legacy CAPTCHA/access-block evidence
- artifact turns do not re-trigger broad-web research recovery
- env reference documents PR test-tool variables; page regenerated

PR #40 defects surfaced by lab gates and fixed here:
- web_fetch generic schema drops top-level anyOf (OpenAI contract);
  the compact preview contract still requires url or urls
- get_weather registered as a brokered network read
- new lazy editor modules precached for offline use
- SearXNG pin mirrored into GPU standalone compose files
- image model picker again skips offline endpoints

Tests updated where PR #40 changed behaviour on purpose, and PR tests
moved onto lab's document_source helpers.

tests/test_background_chat_completion_ui_static.py

@@ -1,10 +1,11 @@
 from pathlib import Path
+from tests.helpers.stylesheets import app_css
 
 
 ROOT = Path(__file__).resolve().parents[1]
 CHAT = (ROOT / "static/js/chat.js").read_text()
 SESSIONS = (ROOT / "static/js/sessions.js").read_text()
-CSS = (ROOT / "static/style.css").read_text()
+CSS = app_css()
 
 
 def test_queued_prompts_are_persisted_per_session_and_restored_on_return():
@@ -24,15 +25,16 @@ def test_background_completion_survives_rerender_and_hidden_selected_chat():
 
 
 def test_sidebar_has_clear_working_and_done_states():
-    assert "session-run-state" in SESSIONS
-    assert "Agent finished while you were away" in SESSIONS
-    assert ".session-run-state.is-working" in CSS
-    assert ".session-run-state.is-done" in CSS
+    # The provider star carries the run state: it spins while working and
+    # becomes a check mark when done. The separate text pill is retired, and
+    # any pill left from an older render is removed.
+    assert "star.classList.toggle('processing', isRunning)" in SESSIONS
+    assert "star.classList.toggle('notify', isCompleted)" in SESSIONS
+    assert "listItem.querySelector('.session-run-state')" in SESSIONS
+    assert "state.remove();" in SESSIONS
     assert ".session-star.notify::after" in CSS
-    assert "content: '\\2713'" in CSS
+    assert "polyline points='20 6 9 17 4 12'" in CSS
     assert ".session-star.notify {\n      animation: none;" in CSS
-    assert "spinnerModule.createWhirlpool(12)" in SESSIONS
-    assert "session-run-whirlpool" in CSS
     assert "state.textContent = 'Working'" not in SESSIONS