feat: add discord-threads skill

[wenkang-xie]

Summary

• New skill (/add-discord-threads) that adds Discord thread management to NanoClaw
• Agents can create and manage threads via MCP tools (discord_create_thread, discord_manage_thread)
• Incoming thread messages are auto-routed so agent replies go to the correct thread
• Follows the fixed-code-file pattern (like x-integration): SKILL.md references standalone code files instead of inline code blocks

File Structure

.claude/skills/add-discord-threads/
├── SKILL.md            # Installation instructions
├── container-skill.md  # Agent-readable skill doc (copied to container)
├── mcp-tools.ts        # Container-side MCP tool registrations
└── ipc-handlers.ts     # Host-side IPC handler functions

How it works

1. Container side: Two MCP tools registered in ipc-mcp-stdio.ts — agent writes IPC task file, polls for result
2. Host side: IPC handler in src/ipc.ts receives task, calls Discord REST API to create/manage threads, writes result file
3. Passive awareness: discord.ts detects thread messages via ThreadChannel, tracks active threads per parent channel, auto-routes replies

Prerequisites

• Discord channel set up (/add-discord)
• Two-layer mount mechanism (PR fix: agent-runner source not updating for existing groups #1053)
• Bot needs MANAGE_THREADS + CREATE_PUBLIC_THREADS Discord permissions

Test plan

• Skill installs cleanly following SKILL.md instructions
• npm run build passes after installation
• npm test passes (271 tests)
• Thread creation works end-to-end via Discord
• Agent replies route to active thread automatically

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