Mutation-scope abandonment lifecycle - #258
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Define the protected-worktree extraction, abandonment entrypoint, store seam, regression coverage, and adapter contract for safely retiring stale mutation scopes while preserving coordinate behavior. Plan: mutation-scope-runtime-integration (T01–T05)
The mutation-trace runtime now centralizes git-dir resolution, worktree locking, external-taint fencing, checkout identity derivation, and successful marker completion in `ProtectedWorktree`. Refactor `coordinate()` to use the guard while preserving existing error and lock-ordering semantics, and document the shared prefix and its test boundary. Plan: `mutation-scope-runtime-integration` — T01
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Promote MutationTraceStore::load_scope to a public, cold-path single-row read that returns durable scope state without widening into a worktree projection or adjudicating worktree identity. Add coverage for known, missing, and cross-worktree scopes while preserving load_worktree's existing mismatch behavior. Document the store contract and mark the runtime-integration task complete in the shared context. Plan: mutation-scope-runtime-integration (T02)
Add `abandon_scope` as the mutation-cursor runtime's second protected entrypoint for retiring scopes whose final worktree boundary was not observed, without assigning them snapshot semantics. Reuse the shared protected-worktree fence and CAS retry limit, classify durable scope state before applying `protocol::abandon`, retry conflicts from fresh state, and clear the fence only after settled outcomes while preserving it for recovery-required results and errors. Add focused TempDir-backed coverage and document the runtime, fence, testing, and plan updates. Plan: mutation-scope-runtime-integration (T03) Co-authored-by: SCE <[email protected]>
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Exercise scope abandonment and successor recovery against real Git worktrees and a repository-scoped Agent Trace DB. Cover ambiguous-gap rebaselining, unrelated live-scope preservation, cross-checkout rejection, and a real CAS race; widen the inner seam only to support the sibling-module race test. Record the completed integration task and its behavioral guarantees in the mutation-trace runtime and scope-abandonment context. Plan: mutation-scope-runtime-integration.md T04 Co-authored-by: SCE <[email protected]>
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Expose the coordinator and scope-abandonment entrypoints with their crate-visible outcome and error types while keeping the runtime safety modules private. Record the lifecycle, staleness, recovery, and attribution rules future harness adapters must follow, and update the runtime indexes and plan status. Plan: mutation-scope-runtime-integration (T05) Co-authored-by: SCE <[email protected]>
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