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/e2e/photo-editor/app-compare-mobile.spec.js

@@ -1,10 +1,17 @@
 const { test, expect } = require('@playwright/test');
 
+async function addAppStyles(page) {
+  const { stylesheetUrls } = await import('../../helpers/stylesheets.mjs');
+  for (const url of await stylesheetUrls()) {
+    await page.addStyleTag({ url });
+  }
+}
+
 
 test('mobile compare uses tabs to show one mounted pane at a time', async ({ page }) => {
   await page.setViewportSize({ width: 390, height: 844 });
   await page.goto('/login');
-  await page.addStyleTag({ url: '/static/style.css?v=20260903comparemodeicons1-emailsettingscards1' });
+  await addAppStyles(page);
 
   await page.evaluate(async () => {
     const { default: state } = await import('/static/js/compare/state.js');
@@ -58,7 +65,7 @@ test('mobile compare uses tabs to show one mounted pane at a time', async ({ pag
 test('mobile compare probe keeps feedback below models and actions split', async ({ page }) => {
   await page.setViewportSize({ width: 390, height: 844 });
   await page.goto('/login');
-  await page.addStyleTag({ url: '/static/style.css?v=20260903comparemodeicons1-emailsettingscards1' });
+  await addAppStyles(page);
   await page.evaluate(() => {
     document.body.innerHTML = `
       <div class="compare-probe-overlay">