Metadata‑driven subtasks (no UI changes): automatic parent resume and single‑open safety

[hannesrudolph]

Closes: #8081

Summary

This update makes subtask hand‑offs smoother while keeping the UI exactly the same:

• Subtasks now maintain their connection from child to parent even when VS Code has been restarted
• Automatic parent resume: when a subtask finishes, the parent continues without a “resume task” prompt.
• Single‑open safety: only one task is open at a time to avoid race conditions and state conflicts.

What you’ll notice

• Fewer interruptions and faster hand‑offs between tasks.
• No visual changes in this PR; all improvements are behavioral.

---

Important

This PR introduces metadata-driven subtasks with automatic parent resume and single-open safety, enhancing task management without UI changes.

• Behavior:
  • Adds metadata-driven subtasks with automatic parent resume and single-open safety.
  • Introduces new events: TaskDelegated, TaskDelegationCompleted, and TaskDelegationResumed in ExtensionChannel.ts and ClineProvider.ts.
  • Ensures only one task is open at a time to avoid race conditions.
• Task Lifecycle:
  • Updates Task.ts to handle delegation events and resume parent tasks automatically.
  • Removes legacy subtask handling methods like completeSubtask().
• Testing:
  • Adds tests for delegation events in ExtensionChannel.test.ts and ClineProvider.spec.ts.
  • Introduces new test files for delegation scenarios, such as delegation-events.spec.ts and nested-delegation-resume.spec.ts.
• Localization:
  • Updates localization files to include new task delegation strings in multiple languages.

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[roomote]

Oroocle   Follow along on Roo Cloud

Re-review at 4cad931b4f273e5a7d75eb9ee604c99814c69dfd: focusing on metadata-driven subtasks, automatic parent resumption, and single-open safety behavior introduced since the last review.

• SkipPrevResponse flag is correctly wired for delegation resume and behaves as intended
• Checkpoint delegation abort noise prevention tests remain in place and cover the critical scenarios
• Partial completion telemetry handler still emits TaskCompleted on partial chunks, which can cause premature or duplicate completion signaling

Previous reviews

• 97f48c8: Review #1
• c15cc38: Review #2
• 4240432: Review #3
• e1cb41d: Review #4
• c749999: Review #5
• 1f59a77: Review #6
• 7b04309: Review #7
• 4325183: Review #8
• 4df3987: Review #9
• 7b04309: Review #10
• 7b04309: Review #11
• 1f59a77: Review #12
• 701ae62: Review #13
• 13fb44b: Review #14
• 384b56c: Review #15
• 13fb44b: Review #16
• 202d343: Review #17
• 8a8f811: Review #18
• 1e130ab: Review #19
• d3f1726: Review #20
• 4c5f13d: Review #21
• 185c1cd: Review #22
• e26dd01: Review #23
• e62deac: Review #24
• 4f08bd9: Review #25
• 8d2617f: Review #26
• db549b9: Review #27
• 8d2617f: Review #28
• b47a930: Review #29
• 40fb6cf: Review #30
• 624f12e: Review #31
• 68281ef: Review #32
• b47a930: Review #33
• 1977ea5: Review #34
• ced7628: Review #35
• e9efe90: Review #36
• 55a953f: Review #37
• 05e6a98: Review #38

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[roomote]

Skipping the entire test suite defeats the purpose of having tests for critical abort noise prevention logic. If these tests are no longer relevant due to the refactor, they should be updated to reflect the new implementation rather than disabled. This leaves the checkpoint abort handling untested and could allow regressions in error handling during task disposal.

_{Fix it with Roo Code or mention @roomote and request a fix.}