feat(claude): add agentic plugin — agents, flows, patterns
Consolidates agentic-flows plugin (v0.5.0) into claude/ folder:
- 14 autonomous agents (engineer tiers, PR resolver, training collector)
- 11 skills (flow orchestration, pattern library, KB learning)
- 8 commands (/junior, /senior, /engineer, /qa, /analyze, /delegate, /seed, /learn)
- 3 patterns (agent-memory, capability-tiers, handoff-protocol)
- MCP server config, hooks, marketplace metadata
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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