feat(skill): add WhatsApp reactions skill (emoji reactions + status tracker) (#509)

* feat(skill): add reactions skill (emoji reactions + status tracker)

* refactor(reactions): minimize overlays per upstream review

Address gavrielc's review on qwibitai/nanoclaw#509:
- SKILL.md: remove all inline code, follow add-telegram/add-whatsapp pattern (465→79 lines)
- Rebuild overlays as minimal deltas against upstream/main base
- ipc-mcp-stdio.ts: upstream base + only react_to_message tool (8% delta)
- ipc.ts: upstream base + only reactions delta (14% delta)
- group-queue.test.ts: upstream base + isActive tests only (5% delta)
- Remove group-queue.ts overlay (isActive provided by container-hardening)
- Remove group-queue.ts from manifest modifies list

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

.claude/skills/add-reactions/add/scripts/migrate-reactions.ts

@@ -0,0 +1,57 @@
+// Database migration script for reactions table
+// Run: npx tsx scripts/migrate-reactions.ts
+
+import Database from 'better-sqlite3';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const STORE_DIR = process.env.STORE_DIR || path.join(process.cwd(), 'store');
+const dbPath = path.join(STORE_DIR, 'messages.db');
+
+console.log(`Migrating database at: ${dbPath}`);
+
+const db = new Database(dbPath);
+
+try {
+  db.transaction(() => {
+    db.exec(`
+      CREATE TABLE IF NOT EXISTS reactions (
+        message_id TEXT NOT NULL,
+        message_chat_jid TEXT NOT NULL,
+        reactor_jid TEXT NOT NULL,
+        reactor_name TEXT,
+        emoji TEXT NOT NULL,
+        timestamp TEXT NOT NULL,
+        PRIMARY KEY (message_id, message_chat_jid, reactor_jid)
+      );
+    `);
+
+    console.log('Created reactions table');
+
+    db.exec(`
+      CREATE INDEX IF NOT EXISTS idx_reactions_message ON reactions(message_id, message_chat_jid);
+      CREATE INDEX IF NOT EXISTS idx_reactions_reactor ON reactions(reactor_jid);
+      CREATE INDEX IF NOT EXISTS idx_reactions_emoji ON reactions(emoji);
+      CREATE INDEX IF NOT EXISTS idx_reactions_timestamp ON reactions(timestamp);
+    `);
+
+    console.log('Created indexes');
+  })();
+
+  const tableInfo = db.prepare(`PRAGMA table_info(reactions)`).all();
+  console.log('\nReactions table schema:');
+  console.table(tableInfo);
+
+  const count = db.prepare(`SELECT COUNT(*) as count FROM reactions`).get() as {
+    count: number;
+  };
+  console.log(`\nCurrent reaction count: ${count.count}`);
+
+  console.log('\nMigration complete!');
+} catch (err) {
+  console.error('Migration failed:', err);
+  process.exit(1);
+} finally {
+  db.close();
+}