Fix#16 kept deletions from registering, but rows created by earlier
runs stayed `status = "active"` forever even after the agent `rm`'d
the file. The DocumentCenter kept showing zombies and
`openWorkProduct` resolved to an empty path.
`ChangeSet` now carries both `changed` and `deleted` paths, populated
from the two detectors:
- git porcelain: the `D` status entries that were previously
dropped are now captured into `deleted` instead;
- baseline diff: paths present in the baseline but no longer on
disk at diff time are `deleted`.
A new `retireDeletedArtifacts` pass runs alongside
`projectChangedPaths` and flips the matching
`work_products.status` to `archived`, bumping `last_touched_by_run_id`
to the retiring run so the provenance timeline records the deletion.
`upsertFilesystemArtifact` sets `status = "active"` on update so a
subsequent run that recreates the path brings the row back into the
visible set. A new `ProjectionOutcome` variant — `retired` — lets the
hook and reconciliation logs report both sides of the fan-out.
ZacharyZhang-NY
0813e691cd