Upgrade pi-coding-agent to 0.70.6

[LikiosSedo]

Summary

• Upgrade @mariozechner/pi-coding-agent from ^0.55.3 to ^0.70.6.
• Adapt Siclaw session creation to the newer pi-agent SDK surface (AuthStorage, ModelRegistry, SettingsManager, tool definition factories, and AgentSessionRuntime).
• Preserve Siclaw custom tool, MCP, WebUI agentbox, context guard, DP/delegation, and compaction behavior.
• Pass provider headers through Siclaw compaction summarization.
• Add namespace-scope guidance to avoid broadening namespace-scoped requests into all-namespace scans.

Validation

• npm run build
• npm test -- src/agentbox/session.test.ts src/core/compaction.test.ts src/core/extensions/compaction-safeguard.test.ts src/core/mcp-client.test.ts src/core/tool-registry.test.ts src/core/guard-pipeline.test.ts src/core/tool-result-context-guard.test.ts
• Earlier full suite on this upgrade branch: npm test (148 files, 3100 passed, 2 skipped)
• Built and pushed test images tagged pi0706-main-20260515-1333-52c3c75-dirty
• Deployed and smoke-tested in sdliu-siclaw via WebUI port-forward:
  • plain chat + SSE completion
  • restricted bash guardrail path
  • successful cluster-aware tool path
  • Stop generating / abort / recovery
  • Deep Investigation mode
  • MCP siflow_diagnose.job_diagnose
  • agentbox pod recycle + same-session restore

Notes

The upgrade keeps Siclaw's existing orchestration and context-management layers. The remaining upgrade-sensitive hooks are streamFn, transformContext, and appendMessage, which are covered by focused tests and WebUI smoke validation here.