feat: Crash recovery salvage: persist verified candidate + resume (not rebuild) + orphan sweep .gN fix (#91)

[mabry1985]

Summary

Crash recovery salvage: persist verified candidate + resume (not rebuild) + orphan sweep .gN fix (#91) (bd-13w)

See the diff for details.

Fixes #91

[protoreview]

QA panel review — PASS

code-review-structural · head 3e09c8af99e9 · formal

[review-synthesizer completed: workflow code-review-structural:report]

Prose Brief

Overall risk: Low — all four LLM finders returned zero findings, and the verifier confirmed the empty panel. The diff is a focused feature addition (sweep-based iteration in loop.py with a new parent_feature_id on Worktree) touching few files.

Fix-first item: None — no defects surfaced. However, the verifier flagged a coverage gap worth a human sanity check: worktree.parent_feature_id is referenced in loop.py's _sweep method but was not found in worktree.py on the default branch at verification time. This may live in a stacked/companion PR, but if it doesn't exist anywhere, the sweep feature silently breaks at runtime.

Panel disagreement: None — all four finders independently returned empty arrays.

Verification changes: The verifier confirmed the empty array; no refuted or uncertain items to process.

Gaps: (1) The structural pass (protopatch) failed with a context-length error — we have no tool-sourced findings for this round. (2) The parent_feature_id existence question noted above.

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[protoreview]

Promoting the PASS verdict for head 3e09c8af99e9: all checks terminal-green, zero unresolved review threads. (approve-on-green)