pi-rnd v0.2.0 — methodology-first port of rnd-framework to PI runtime

Ships:
- 11 methodology skills (using-rnd-framework, rnd-{orchestration,decomposition,scaling,iteration,building,verification,experiments,failure-modes}, kiss-practices, fp-practices)
- 4 subagent definitions (rnd-planner, rnd-builder, rnd-verifier, rnd-integrator)
- /rnd-start <task> orchestrator (plan -> build -> verify -> integrate)
- /rnd-doctor v0.2 (PI runtime + agent/skill discovery + gate registry + round-trip)
- Composable tool_call gate registry with 3 seed gates

Artifacts