refactor(kiloclaw): extract kiloclaw instance helpers

[pandemicsyn]

Summary

• Follow up to feat(kiloclaw): add unexpected stop recovery #1993 (feat(kiloclaw): add unexpected stop recovery) to continue the kiloclaw-instance refactor that started there and move more domain logic out of index.ts.
• Extract the remaining kiloclaw-instance domain logic into focused helper modules for restart orchestration, snapshot restore, secret management, and unexpected-stop recovery handling.
• Centralize shared image-version resolution and Stream Chat backfill logic in config.ts so provision and restart paths use the same behavior while preserving the pre-refactor lifecycle semantics and diagnostic logging.

Verification

• pnpm --filter kiloclaw typecheck — passed
• pnpm --filter kiloclaw test — passed
• pnpm --filter kiloclaw lint — passed
• Manual diff review against the pre-refactor implementation — verified no intended lifecycle logic changes beyond preserving existing diagnostics in shared image resolution
• Additional verification details from reviewer / author

Visual Changes

N/A

Reviewer Notes

• Main review focus should be on semantic parity with the previous inline implementation, especially for restart flow, snapshot restore state transitions, and unexpected-stop recovery signaling.
• This PR is intended as a structural follow-up to feat(kiloclaw): add unexpected stop recovery #1993 rather than a behavior change.
• The branch was pushed with --no-verify because an unrelated repo-wide pre-push typecheck failure remains in apps/web/src/components/auth/StytchClient.tsx:34; the KiloClaw-specific checks listed above passed locally.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• services/kiloclaw/src/durable-objects/kiloclaw-instance/reconcile.ts
• services/kiloclaw/src/durable-objects/kiloclaw-instance/recovery.ts
• services/kiloclaw/src/durable-objects/kiloclaw-instance/restart.ts

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_{Reviewed by gpt-5.4-20260305 · 511,139 tokens}