Add assess_workspace_mutation_consistency to review_proofs: final
reports fail validation when they claim "Workspace mutations: none"
while worktree mutations (reset --hard, checkout, clean, worktree
add/remove, stash, merge, rebase, ...) occurred — either observed in
the workflow command log or self-reported in the report's own
"Worktree mutations" field. Observed worktree and git ref mutations
must be reported under their precise category fields; reports pass
when they say "File edits by reviewer: none" alongside a non-none
"Worktree mutations" entry. Tests cover reset, checkout, worktree add,
clean, fetch-only, and no-op cases.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
