cleanup: remove clawd/openclaw references, fix permissions, add architecture docs

- Replace all ~/clawd and ~/.clawdbot paths with ~/echo-core equivalents
  in tools (git_commit, ralph_prd_generator, backup_config, lead-gen)
- Update personality files: TOOLS.md repo/paths, AGENTS.md security audit cmd
- Migrate HANDOFF.md architectural decisions to docs/architecture.md
- Tighten credentials/ dir to 700, add to .gitignore
- Add .claude/ and *.pid to .gitignore
- Various adapter, router, and session improvements from prior work

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bridge/whatsapp/index.js

@@ -158,6 +158,27 @@ app.post('/send', async (req, res) => {
   }
 });
 
+app.post('/react', async (req, res) => {
+  const { to, id, emoji, fromMe, participant } = req.body || {};
+
+  if (!to || !id || emoji == null) {
+    return res.status(400).json({ ok: false, error: 'missing "to", "id", or "emoji" in body' });
+  }
+  if (!connected || !sock) {
+    return res.status(503).json({ ok: false, error: 'not connected to WhatsApp' });
+  }
+
+  try {
+    const key = { remoteJid: to, id, fromMe: fromMe || false };
+    if (participant) key.participant = participant;
+    await sock.sendMessage(to, { react: { text: emoji, key } });
+    res.json({ ok: true });
+  } catch (err) {
+    console.error('[whatsapp] React failed:', err.message);
+    res.status(500).json({ ok: false, error: err.message });
+  }
+});
+
 app.get('/messages', (_req, res) => {
   const messages = messageQueue.splice(0);
   res.json({ messages });