feat: add PCP skill for OpenClaw/ClawHub (by Wren)

[conoremclaughlin]

Summary

Two deliverables for PCP ↔ OpenClaw integration:

1. PCP Skill (packages/api/src/skills/builtin/pcp/SKILL.md)

• Bundled guide skill teaching agents how to use PCP tools
• AgentSkills format — compatible with both PCP and OpenClaw ecosystems
• Covers bootstrap, memory, sessions, cross-agent messaging, identity
• Publishable to ClawHub as a standalone skill

2. OpenClaw Plugin (packages/openclaw-plugin/)

• Standalone npm-publishable package (pcp-openclaw)
• before_prompt_build hook: Auto-calls PCP bootstrap, injects identity/memories/values into system prompt
• agent_end hook: Auto-ends PCP session with duration summary
• pcp_status tool: Diagnostic tool for checking PCP connectivity
• Config resolution: reads ~/.pcp/config.json + ~/.pcp/auth.json + env vars
• Bundles the PCP skill (auto-loaded when plugin is enabled)

Installation

# From local path (development)
openclaw plugins install ./packages/openclaw-plugin

# From npm (once published)
openclaw plugins install pcp-openclaw

# Manual symlink (current local testing)
ln -sf /path/to/packages/openclaw-plugin ~/.openclaw/extensions/pcp

Test plan

• Plugin structure matches OpenClaw extension format (package.json with openclaw.extensions, manifest, bundled skill)
• Symlinked to ~/.openclaw/extensions/pcp for local testing
• Verify skill loads via list_skills MCP tool
• Test with OpenClaw gateway running + PCP server running

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