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/container/skills/reactions/SKILL.md

@@ -0,0 +1,63 @@
+---
+name: reactions
+description: React to WhatsApp messages with emoji. Use when the user asks you to react, when acknowledging a message with a reaction makes sense, or when you want to express a quick response without sending a full message.
+---
+
+# Reactions
+
+React to messages with emoji using the `mcp__nanoclaw__react_to_message` tool.
+
+## When to use
+
+- User explicitly asks you to react ("react with a thumbs up", "heart that message")
+- Quick acknowledgment is more appropriate than a full text reply
+- Expressing agreement, approval, or emotion about a specific message
+
+## How to use
+
+### React to the latest message
+
+```
+mcp__nanoclaw__react_to_message(emoji: "👍")
+```
+
+Omitting `message_id` reacts to the most recent message in the chat.
+
+### React to a specific message
+
+```
+mcp__nanoclaw__react_to_message(emoji: "❤️", message_id: "3EB0F4C9E7...")
+```
+
+Pass a `message_id` to react to a specific message. You can find message IDs by querying the messages database:
+
+```bash
+sqlite3 /workspace/project/store/messages.db "
+  SELECT id, sender_name, substr(content, 1, 80), timestamp
+  FROM messages
+  WHERE chat_jid = '<chat_jid>'
+  ORDER BY timestamp DESC
+  LIMIT 5;
+"
+```
+
+### Remove a reaction
+
+Send an empty string to remove your reaction:
+
+```
+mcp__nanoclaw__react_to_message(emoji: "")
+```
+
+## Common emoji
+
+| Emoji | When to use |
+|-------|-------------|
+| 👍 | Acknowledgment, approval |
+| ❤️ | Appreciation, love |
+| 😂 | Something funny |
+| 🔥 | Impressive, exciting |
+| 🎉 | Celebration, congrats |
+| 🙏 | Thanks, prayer |
+| ✅ | Task done, confirmed |
+| ❓ | Needs clarification |