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golangLAKEHOUSE/reports/cutover/gauntlet_2026-05-02/parity/embed_parity.md
root 0e530f4436 drift fix: validatord in start_go_stack + parity refresh 
Two anchor-vs-reality drifts found during /read-mem audit:

1. start_go_stack.sh never started validatord :3221, even though
   it shipped 2026-05-02 (f9e7241) and STATE_OF_PLAY claims it as
   part of the persistent stack. Cold-boot quietly omitted it,
   leaving /v1/iterate unreachable on the persistent gateway.
   Fix: factored chatd's conditional-start block into a start_shared
   helper, called for both chatd :3220 and validatord :3221. Same
   shared-with-smokes posture as chatd (no S3 / JSONL-only state,
   no temp-toml override needed).

2. STATE_OF_PLAY header claimed 3 parity probes / 32 assertions.
   Reality is 6 probes / 38 assertions since subject_audit landed
   in 262a77a (2026-05-03). Header refreshed; cross-references
   the three runtime-divergence classes documented at
   lakehouse/STATE_OF_PLAY.md lines 36-39.

Parity reports regenerated as verification artifact (all 6 still
green: 8+12+2+4+1+6). Same pattern as c0a55b1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-05 03:27:47 -05:00

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/v1/embed cross-runtime parity probe

Date: 2026-05-05T08:22:55Z Rust: http://127.0.0.1:3100/ai/embed · Go: http://127.0.0.1:4110/v1/embed Model: nomic-embed-text (forced — overrides each side's default) Match metric: cosine similarity ≥ 0.99999

Identical text → both endpoints. Cosine compares vector DIRECTION (the operationally-meaningful property for HNSW retrieval); byte-equal isn't expected because Go round-trips through float32 internally while Rust stays at f64.

Tally: 8 match · 0 diff (out of 8 fixtures)

Cosine ≥ 0.99999 on every fixture — embed parity holds post-sidecar-drop. Rust and Go produce vectors that point in the same direction in 768-dim space.