fix: reattach a retried compile to the timed-out in-flight compile

[hatayama]

Summary

• After COMPILE_WAIT_TIMEOUT, a later uloop compile reattaches to the in-flight or completed compile instead of starting a new one that hits UNITY_SERVER_BUSY.
• Timeout guidance now describes that reattach recovery path and the remaining result-retention window.

User Impact

• Before: retrying uloop compile after a wait timeout started a new compile and was often rejected as busy while Unity was still compiling.
• After: retry reuses the timed-out request id, waits for or returns its result, and clears the pending marker when done.

Changes

• Persist .uloop/pending-compile-request.json on wait timeout (20-minute stale window aligned with Unity result retention).
• Before sending a new compile, probe get-compile-status with up to 10s of retries, then attach/wait, return a stored result, or fall through per force-recompile / missing-result rules.
• Rewrite COMPILE_WAIT_TIMEOUT NextActions for reattach; add attach vibe-log events and branch coverage tests.

Verification

• scripts/check-go-cli.sh passed.
• E2E with ULOOP_DEBUG=1 and the local dist binary:
  1. --compile-wait-timeout-seconds 1 --force-recompile → COMPILE_WAIT_TIMEOUT + pending record written
  2. Immediate plain uloop compile → not UNITY_SERVER_BUSY; attached and cleared pending record
  3. Timeout again, wait until idle, plain uloop compile → cli_compile_attach_result with stored_result and no later cli_compile_request_prepared / cli_compile_request_send_result

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 9837e2a2-b535-4efe-bd6e-2a03666f5de9

📥 Commits

Reviewing files that changed from the base of the PR and between 3bbc7bd and ca62f45.

📒 Files selected for processing (8)

• cli/project-runner/internal/projectrunner/compile_attach.go
• cli/project-runner/internal/projectrunner/compile_attach_test.go
• cli/project-runner/internal/projectrunner/compile_pending_record.go
• cli/project-runner/internal/projectrunner/compile_pending_record_test.go
• cli/project-runner/internal/projectrunner/compile_wait_deps.go
• cli/project-runner/internal/projectrunner/compile_wait_test.go
• cli/project-runner/internal/projectrunner/execution_errors.go
• cli/project-runner/internal/projectrunner/run.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/issue-2032-attach-recovery

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