fix(cli): recover compaction from payload limits

[marius-kilocode]

Summary

• Recover failed compactions when provider payload-size limits reject large request bodies.
• Move the destructive stripping/retry behavior into Kilo-specific compaction recovery code while keeping shared opencode hooks minimal.
• Cover payload-limit recovery for media attachments and old tool outputs.

Test plan

• bun test test/session/compaction.test.ts
• bun test test/kilocode/compaction-payload-recovery.test.ts
• bun test test/session/processor-effect.test.ts
• bun test test/session/message-v2.test.ts
• bun run typecheck
• bun run script/check-opencode-annotations.ts
• git diff --check

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• packages/opencode/src/kilocode/session/compaction-payload-recovery.ts
• packages/opencode/src/session/compaction.ts
• packages/opencode/src/session/processor.ts

---

_{Reviewed by gpt-5.5-2026-04-23 · 741,121 tokens}

[marius-kilocode]

Moved more logic to kilo files to reduce conflicts