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_chatgpt_reasoning_and_grouping.py

@@ -12,6 +12,7 @@ import subprocess
 import pytest
 
 from src import chatgpt_subscription, llm_core
+from tests.helpers.stylesheets import app_css
 
 ROOT = Path(__file__).parents[1]
 
@@ -99,23 +100,24 @@ def test_model_picker_source_invariants():
 
 
 def test_composer_reasoning_effort_ui_markup():
-    """Verify static/index.html and static/style.css include reasoning effort controls."""
+    """Verify static/index.html and the app stylesheet cascade include reasoning effort controls."""
     html = (ROOT / "static/index.html").read_text(encoding="utf-8")
-    css = (ROOT / "static/style.css").read_text(encoding="utf-8")
+    css = app_css()
     # HTML elements
     assert 'id="reasoning-effort-wrap"' in html
     assert 'id="reasoning-effort-btn"' in html
     assert 'id="reasoning-effort-current"' in html
     assert 'id="reasoning-effort-menu"' in html
     assert 'title="Reasoning effort"' in html
-    assert 'class="reasoning-effort-prefix">Effort: </span>' in html
+    assert 'class="reasoning-effort-prefix">Reasoning effort</span>' in html
     # CSS classes
     assert ".reasoning-effort-wrap" in css
     assert ".reasoning-effort-btn" in css
     assert ".reasoning-effort-menu" in css
     assert ".reasoning-effort-option" in css
-    # Responsive hide of prefix
-    assert ".reasoning-effort-prefix { display: none; }" in css
+    # The control lives in the Chat Context popup, where the prefix is the
+    # row label rather than chat-bar text hidden at narrow widths.
+    assert ".chat-context-popup .reasoning-effort-prefix {" in css
 
 
 def test_chat_submit_includes_reasoning_effort():