refactor: move agent runtime into host connector

[yoloyash]

Summary

• move Codex, Pi, and Oh My Pi process, provider, live-session, queue, and timeline ownership into the Host Connector
• replace protocol v1 in place with high-level daemon commands plus sequenced event delivery and acknowledgements
• add connector-local state journaling, command deduplication, reconnect recovery, and authorization reconciliation
• move shared wire and presentation types into agent-bridge and remove the provider runtime from Next.js
• release the matching Host Connector as 0.2.0 with no compatibility layer

Verification

• npm run test
• npm run typecheck
• npm run lint
• npm run build
• isolated agent-connection E2E: 3 passed, 4 opt-in provider tests skipped
• production Docker builder target
• git diff --check and stale agent-runtime/protocol search

Cutover note

This intentionally replaces Host Connector protocol v1 and requires reinstalling Connector 0.2.0. There is no old-protocol compatibility path.