Implement `mark_superseded(ids, *, superseded_by=None, reason=None)` — the SOLE
supersession verb Worldtree #364's promotion-hygiene reconciliation calls to retire
contradicted facts (wire shape confirmed by worldtree-dev, bifrost_memory_store.py:293).
Live re-verify (2026-07-16) proved our provider 500-crashed on this call (unimplemented)
→ #364's retirement couldn't land + a retry-storm bloated the store; the readout only
passed via transient recency-eviction.
- `mark_superseded` mirrors the reference `_mark_lifecycle`: sets top-level
`superseded=True` (+ `superseded_by`/`superseded_reason` when non-None), increments
revision, NON-destructive (get still returns; recoverable). Unknown ids skipped.
- `_is_live` (INV-011) now short-circuits on `superseded is True`, so a retired chunk is
excluded from `scan` (person-prime) — durable retirement, not just recency-eviction.
search is unfiltered (matches reference; WT re-checks liveness client-side).
- Contract: un-defer mark_superseded (+ FN spec, INV-011); TDD 5/5 (retires-from-scan
tracer, non-destructive-get, unknown-id no-op, non-None-fields-only, parity #195).
- bifrost 1.1.1→1.1.4: hasattr-gate backstop for the maintenance verbs (unimplemented
verb → unsupported_capability 400, never AttributeError/500/retry-storm — the gap we
surfaced) + the 1.1.3 scan/cursor conformance harness. Full suite 644 green.
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