Reification, not a cache. Densely co-wired relational neighborhoods are crystallized
into DURABLE first-class store records that survive restart, load on boot, and evolve
via supersede+provenance -- so the geometry-priming hot path READS persisted structure
instead of computing a per-query descriptor (the M9 3.2x/13x latency blocker).
engram_geometry.{h,c}:
- engram_geo_reify_store(): detect hub-anchored neighborhoods on the hebb-weighted
graph (greedy non-redundant cover), compute each centered descriptor ONCE against
the true store-wide mean, persist as node_type="Neighborhood" (raw centroid in emb,
membership+scalars+axis-extents in a compact GEO1 metadata schema) + member edges,
superseding any prior same-hub record. The mean is persisted once as "GeoMeanFrame".
- resident loaded form (index_new/add/finalize/lookup): parses the durable records at
boot (never recomputes geometry); O(seeds) membership lookup, miss -> centroid-nearest.
- descriptor: skip the Jacobi eigensolve when top_axes==0; reject structural records as
members (id-convention + node_type guards) so re-reify/ad-hoc stay clean.
el_runtime.c:
- boot routes Neighborhood/GeoMeanFrame records OUT of the activation graph into the
reify index, and skips member edges from adjacency -> ENGRAM_GEOMETRY_PRIMING OFF is
byte-identical to M8/M9 (verified across 15 queries).
- priming hot path reads the persisted membership; ENGRAM_GEO_PRIMING_NOCACHE=1 keeps
the M9 per-query descriptor for ad-hoc geometries / A/B control.
A/B on a COPY (128 neighborhoods): priming ON is now FLAT latency (1.06x median / 1.03x
p90 vs OFF) where the M9 per-query path is 3.30x/10.5x. Reified records provably inert
when OFF. Restart survival + supersede verified. Build 0 warnings (my code); ASan/UBSan
clean on module and full server hot path. Recall quality re-eval against the TRUE mean
still shows no reliable gain (mean coherence -0.017), so geometry-priming STAYS default-OFF
-- but the latency blocker is removed and the durable structure now exists. See
docs/architecture/design/engram-m10-reification.md.
will.anderson
f6a0777f90