fix: compute deleted files in task checkpoints

[fakepixels]

Summary

• Resolves the TODO: compute deleted files in handleClaudeCodePostTask (line 668)
• Task checkpoints now correctly track file deletions, matching the behavior of the Stop handler and PostTodo handler

Problem

handleClaudeCodePostTask was passing nil for DeletedFiles when building TaskCheckpointContext. This meant that when a subagent deleted files during a Task, those deletions were silently dropped from checkpoint metadata — making attribution tracking and session analysis incomplete.

Before: Task checkpoints recorded modified and new files, but deletions were always nil.
After: Deleted files are computed from git status using the existing ComputeDeletedFiles() function and included in task checkpoint metadata.

Changes

• Call ComputeDeletedFiles() to detect tracked files that were deleted (same pattern used by the Stop handler at line 232 and PostTodo handler at line 423)
• Filter and normalize the deleted file paths (consistent with modified/new file handling)
• Include deleted files in the no-changes guard so task checkpoints with only deletions are still recorded
• Replace nil with the computed relDeletedFiles in TaskCheckpointContext

Test plan

• Verified the change follows the exact same pattern as the Stop handler (ComputeFileChanges) and PostTodo handler (DetectChangedFiles)
• ComputeDeletedFiles is already covered by existing tests (TestComputeFileChanges_DeletedFilesWithNilPreState, TestComputeFileChanges_NewAndDeletedFiles)
• CI: mise run fmt, mise run lint, mise run test:ci

🤖 Generated with Claude Code

---

Note

Medium Risk
Touches core change-detection logic used by multiple hook paths; subtle nil-vs-empty semantics could affect whether checkpoints are created or which files are attributed.

Overview
Task (subagent) checkpoints now capture deleted tracked files and will create a checkpoint even when the only changes are deletions (instead of silently dropping them).

Refactors ComputeFileChanges to accept a pre-captured untracked-file slice (nil meaning “skip new-file detection”), adds PreUntrackedFiles() helpers on PrePromptState/PreTaskState to preserve nil-vs-empty semantics for backward compatibility, and updates all hook/debug call sites accordingly; removes older task new-file helpers and related tests.

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[fakepixels]

Big fan of the project & congrats on launch. Committing a small PR to contribute.

[toothbrush]

Hey @fakepixels, good pickup and thanks for your contribution. I had a look, and made some improvements.

I refactored the function a bit, to use ComputeFileChanges which returns new files (created during session) and deleted files (tracked files that were deleted) using a single git status call. This ought to be more efficient.

cli/cmd/entire/cli/state.go

Lines 211 to 217 in 07743be

	// ComputeFileChanges returns new files (created during session) and deleted files
	// (tracked files that were deleted) using a single git status call.
	// This is more efficient than calling ComputeNewFiles and ComputeDeletedFiles separately.
	//
	// If preState is nil, newFiles will be nil but deletedFiles will still be computed
	// (deleted files don't depend on pre-prompt state).
	func ComputeFileChanges(preState *PrePromptState) (newFiles, deletedFiles []string, err error) {

This removes the reference to ComputeNewFilesFromTask and ComputeDeletedFiles, both of which are marked as deprecated:

cli/cmd/entire/cli/state.go

Lines 265 to 269 in 07743be

	// ComputeNewFiles compares current untracked files with pre-prompt state
	// to find files that were created during the session.
	//
	// Deprecated: Use ComputeFileChanges instead for better performance.
	func ComputeNewFiles(preState *PrePromptState) ([]string, error) {

cli/cmd/entire/cli/state.go

Lines 282 to 286 in 07743be

	// ComputeDeletedFiles returns files that were deleted during the session
	// (tracked files that no longer exist).
	//
	// Deprecated: Use ComputeFileChanges instead for better performance.
	func ComputeDeletedFiles() ([]string, error) {

That let me remove some of the dead code in that module too, which is a win. Thanks! 🙌

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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