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.

src/browser_observation.py

@@ -17,7 +17,9 @@ def compact_browser_observation(value, budget=8000):
                 notices.append('Exit code: ' + str(item['exit_code']))
             if item.get('success') is False:
                 notices.append('Browser command failed.')
-            snapshot = item.get('snapshot')
+            snapshot = item.get('snapshot') or item.get('text')
+            if item.get('title'):
+                notices.append('Title: ' + str(item['title']))
             url = item.get('url') or item.get('origin')
             if isinstance(snapshot, str) and snapshot.strip():
                 # Snapshot text already contains labels and refs in DOM order.