In workspace mode the executor now captures changes and verifies worktree
invariants per acquired sub-repo instead of degrading to empty against the
non-git root. Post-session capture (:7898) gains a workspace branch that loops
task.workspaceWorktrees and reuses captureModifiedFiles(repo.worktreePath,
repo.baseCommitSha, …) per repo — inheriting resolveDiffBaseRef's merge-base
fallback (repo baseCommitSha may be undefined) and the filterFilesToOwnTaskCommits
contamination/divergence audit — then prefixes each repo's files with the repo
path into task.modifiedFiles. Branch attribution runs per sub-repo (cwd), never
against the root. The no-op assertCleanBranchAtBase is not iterated.
verifyWorktreeInvariants is un-stubbed for workspace mode: it iterates every
workspaceWorktrees entry asserting toplevel match + HEAD on fusion/<id>, and
returns the FIRST failing repo while preserving the exact discriminated union
{ok:true} | {ok:false; reason:'wrong_toplevel'|'wrong_branch'|'no_commits';
observed; expected} (the :10889 consumer switches on reason for requeue/handoff)
— the new repo field is additive. Singular non-workspace path unchanged.
Real two-repo fixture tests (capture A+B repo-prefixed vs own base, undefined-base
fallback, foreign-commit contamination audit, wrong_branch verify failure,
single-repo regression). Gate green: typecheck, lint, test:gate (649+58).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
