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.

static/js/settings/writingStyle.js

@@ -0,0 +1,71 @@
+// Document writing-style settings panel.
+// Extracted verbatim from static/js/settings.js. Behaviour is unchanged: the
+// functions moved, their bodies did not. settings.js imports them and calls
+// them from the same places, so load order and init sequence are untouched.
+
+import { byId as el } from './dom.js';
+import { postSettings as _postSettings } from './api.js';
+
+export async function initDocumentWritingStyle() {
+  const styleEl = el('set-document-style');
+  const saveBtn = el('set-document-style-save');
+  const extractBtn = el('set-document-style-extract');
+  const fileEl = el('set-document-style-file');
+  const msg = el('set-document-style-msg');
+  if (!styleEl || !saveBtn) return;
+  try {
+    const res = await fetch('/api/auth/settings', { credentials: 'same-origin' });
+    const data = await res.json();
+    styleEl.value = String(data.document_writing_style || '');
+  } catch (_) {
+    if (msg) msg.textContent = 'Failed to load';
+  }
+  saveBtn.addEventListener('click', async () => {
+    if (msg) msg.textContent = 'Saving...';
+    try {
+      const res = await _postSettings({ document_writing_style: styleEl.value });
+      if (!res.ok) throw new Error(`HTTP ${res.status}`);
+      if (msg) msg.textContent = '✓ Saved';
+    } catch (e) {
+      if (msg) msg.textContent = e.status === 403 ? 'Admin access is required to change these settings.' : 'Failed to save';
+    }
+    setTimeout(() => { if (msg) msg.textContent = ''; }, 3000);
+  });
+  extractBtn?.addEventListener('click', () => fileEl?.click());
+  fileEl?.addEventListener('change', async () => {
+    const file = fileEl.files?.[0];
+    if (!file) return;
+    extractBtn.disabled = true;
+    let whirlpool = null;
+    if (msg) {
+      msg.replaceChildren();
+      try {
+        const spinner = window.spinnerModule || (await import('../spinner.js')).default;
+        whirlpool = spinner.createWhirlpool(14);
+        whirlpool.element.style.cssText = 'display:inline-flex;width:14px;height:14px;margin-right:7px;';
+        const label = document.createElement('span');
+        label.textContent = 'Analyzing...';
+        msg.append(whirlpool.element, label);
+      } catch (_) {
+        msg.textContent = 'Analyzing...';
+      }
+    }
+    try {
+      const body = new FormData();
+      body.append('file', file);
+      const res = await fetch('/api/auth/settings/document-style/extract', {
+        method: 'POST', credentials: 'same-origin', body,
+      });
+      const data = await res.json().catch(() => ({}));
+      if (!res.ok || !data.style) throw new Error(data.detail || data.error || 'Extraction failed');
+      styleEl.value = String(data.style);
+      if (msg) msg.textContent = '✓ Extracted — review and save';
+    } catch (error) {
+      if (msg) msg.textContent = error.message || 'Extraction failed';
+    } finally {
+      whirlpool?.destroy?.();
+      extractBtn.disabled = false;
+      fileEl.value = '';
+    }
+  });
+}