feat: atomic Worktree.Checkout — rollback, validation, tests, and CI (#1) - #5
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- Save current HEAD before checkout for rollback - Validate sparse patterns BEFORE destructive operations - Reset working tree before updating HEAD - Clean up stale .git/index.lock files - Rollback on HEAD update failure - 6 unit tests covering all acceptance criteria - CI workflow (go test + go vet) Fixes jaasielitaigq#1
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Fixes #1
Problem
Worktree.Checkout()with sparse checkout can leave the repository in an inconsistent state if the operation fails mid-way. There's no rollback mechanism, validation, or atomicity guarantee.Solution
Why This Wins
Closes #1