Found while enumerating archive-exclusion sites for #3041.
## Unambiguously dead
`liveParentFilter` has exactly **one** reference in the repo: its own
definition.
- not exported from `index.ts` or `index.gate.ts`
- no test imports it
- no production code calls it
It nonetheless contained `column != 'archived'`, so it was one of the 22
sites the SQL column-literal gate tracks.
## Why delete rather than convert
Converting it would mean adding lane resolution to code nothing runs —
risk with no behaviour. That's the same argument #3041 makes for *not*
converting the other two dead sites; deleting is the version of it that
also removes the literal.
## The gate it documents is not being deleted
Its docblock describes the document/artifact visibility gate
(VAL-CROSS-015). That gate is real and still enforced — by the inline
conditions inside `listLiveTaskDocuments` and `listLiveArtifacts`, which
is presumably why this helper was never wired up in the first place.
Only the unused composition goes.
## Measured
| check | result |
|---|---|
| SQL literal population | **22 → 21**; the gate ratcheted its own
baseline down and asked for the commit, included here |
| `taskstore-remaining.test.ts` (archive-lineage suite) | **27 tests
green** |
| six gates + `tsc` | green |
## Not deleted, deliberately
`listLiveTaskDocuments` and `listLiveArtifacts` are referenced **only**
by that test file. That's a weaker signal than zero references — someone
may have written them ahead of a consumer. Their literals stay counted,
which is the honest state for code whose intent I can't read from the
repo.
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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