First-occurrence-keeps-bare was walk-order-dependent ACROSS runs: a source
that got the suffixed slug once could take the bare slug the next run (its
collider aged out or was skipped as unchanged), leaving gbrain holding the
same transcript under two slugs — and a NEW collider could claim a bare
slug that state shows belongs to an unchanged source, silently overwriting
that page. disambiguateSlugs now consults state.sessions: a recorded slug
stays owned by its source_path, re-ingested sources keep their slug
verbatim, fresh assignments never take another source's slug, and legacy
duplicate records (pre-#2724 overwrites) resolve first-owner-wins and
self-heal on the next state write. Stateless behavior is unchanged.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Garry Tan
9eab3ca336