feat: Gemini bridge, browser extension hardening, shared memory

Nexus gateway (measured 2026-08-07, not assumed):
- Gemini speaks Google-GenAI (/v1beta/models/{id}:streamGenerateContent, header
  api-key), NOT the Azure-OpenAI path — that returned 404 "no Route matched" and
  was the cause of the reported failures. New agent/gemini_bridge.py translates
  Bedrock Converse <-> Gemini in both directions.
- Only gemini-3.6-flash is subscribed; 2.5-flash/2.5-pro/3.1-flash-lite give 403,
  every other name 404. Catalog corrected.
- Four Gemini rules, each previously an HTTP 400, now covered by tests:
  thought signatures are mandatory, they belong to the TURN (not the individual
  call), functionResponse turns must be homogeneous, arrays need `items`.
- Prompt caching is NOT available: cachePoint is accepted and ignored.

System prompt:
- Was an f-string; a code sample containing braces broke build_system_prompt at
  request time (CLI and web both 500, import stayed green). Now a plain template
  with __TOKEN__ placeholders. Regression guards in tests/test_system_prompt.py.

CLI:
- `agent resume` now prints the stored transcript. The history was always loaded
  into the model context, only the terminal stayed empty.

Memory (new, all three surfaces):
- agent/memory.py stores notes about the user in one local file, written
  atomically; memory.cnull.net remains an optional mirror that can never fail a
  write. Tools memory_save/search/forget, injected into the prompt with a budget.
  HTTP surface /api/memory for the extension.

Browser extension (agent/extension, first commit of the source):
- driveMode 'direct' talks to Nexus without the Python broker: Claude via
  Bedrock converse, GPT via Azure-OpenAI, Gemini via Google-GenAI.
- browser_type no longer guesses the focused element — that wrote whole mails
  into Outlook's subject line. Read-back now reports where the text actually
  landed, so a mis-target is visible instead of silent.
- aria-labelledby is resolved across all ids (it is a list); contenteditable is
  interactive and marked editable. Without this, subject and message body look
  identical to the model.
- Hard block against sending mail, independent of riskMode.
- Runs survive the panel: events are buffered and replayed by sequence number.
- Image input (paste, file, drag&drop), on-page glow/spotlight, memory tools.

Cost: fixed tokens per round 11434 -> 6540 (-43%) by trimming tool schemas,
dropping gateway docs from the browser prompt and sending site knowledge only
where it applies.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

esbuild.config.mjs

@@ -0,0 +1,51 @@
+import * as esbuild from 'esbuild';
+import { readFileSync } from 'fs';
+
+const watch = process.argv.includes('--watch');
+
+/** @type {import('esbuild').BuildOptions} */
+const common = {
+  bundle: true,
+  sourcemap: true,
+  target: 'es2022',
+  format: 'esm',
+  logLevel: 'info',
+};
+
+const configs = [
+  {
+    ...common,
+    entryPoints: ['src/background/index.ts'],
+    outfile: 'dist/background.js',
+  },
+  {
+    ...common,
+    entryPoints: ['src/content/inject.ts'],
+    outfile: 'dist/content.js',
+  },
+  {
+    ...common,
+    entryPoints: ['src/sidepanel/app.ts'],
+    outfile: 'dist/sidepanel.js',
+  },
+  {
+    // Laeuft per Manifest in der MAIN world der Seite. Nur so ist der Konsolen-Hook
+    // von der Content-Security-Policy der Seite ausgenommen.
+    ...common,
+    format: 'iife',
+    entryPoints: ['src/content/console-hook.ts'],
+    outfile: 'dist/console-hook.js',
+  },
+];
+
+if (watch) {
+  for (const cfg of configs) {
+    const ctx = await esbuild.context(cfg);
+    await ctx.watch();
+  }
+  console.log('Watching...');
+} else {
+  for (const cfg of configs) {
+    await esbuild.build(cfg);
+  }
+}