git_overview hides EXCLUDED_LOCK_FILES from the model so lock files never drive
split decisions, but runSplitCommit then re-fetched the raw staged set and
rejected any plan that failed to enumerate them, aborting `omp commit` with
"Split commit plan missing staged files: <lockfile>". Skipping the validator
would have masked a real drop — the executor resets the index and only
re-stages files listed in each commit group.
Introduce packages/coding-agent/src/commit/agentic/lock-files.ts with a
LOCK_FILE_MANIFESTS map and an assignLockFilesToPlan helper that attaches each
orphaned lock file to (1) the commit group touching a sibling manifest in the
same directory, (2) any commit group touching a matching manifest, or (3) the
last commit group. git-overview.ts imports EXCLUDED_LOCK_FILES from the shared
module so the filter and the pairing table stay in sync.
Fixes#4632
roboomp