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Implements #142 behaviour fresh on the epic base: header-only pin-file loader (ggml/src/hydra-pins.h, one format, one parser for every consult path) with hard fail on fopen error and on any unparseable line, load-time dedupe with counts, one-line load summary (file, layers, total pins, per-layer min/max, dups removed). Engagement counter exposed, incremented only via the E1 hook. Attach-time VRAM fit check fails loudly with required, free, and shortfall arithmetic. Dedupe substance of #146 absorbed here (Refs #146); range-check moves to the E1 validate hook hydra_pins_validate_range. Assisted-by: Muse Spark
Implements #143 behaviour: per-(layer, site) rings (last 1024) reporting n, p50, p99, mean microseconds per branch, with gpu, cpu, and combine branches never merged. Kernel-launch attribution kept apart from event-measured time. GPU branch values must come from lazily harvested CUDA events (host timers measure launch, not execution); CPU branch uses host wall time. Instrument cost documented in the block contract. Assisted-by: Muse Spark
Implements #144 behaviour: hits over lookups on the k-per-token lookup basis, recorded per (layer, site) with h = hits/lookups plus totals. Exactly one path records by construction on this base, so no blended semantics are possible. Every dump line labelled decode-only; callers documented as decode-gated. Assisted-by: Muse Spark
This was referenced Sep 19, 2026
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E0 measurement foundation for epic #148, built fresh on the rebased epic base (86af0c9, contains upstream 90e0f5c). The gather pilot (PR #134) is NOT ported; only the concepts of #142/#143/#144 survive, per the epic ruling.
Closes #142, closes #143, closes #144. Dedupe substance of #146 absorbed into the #142 commit (range-check moves to the E1 validate hook).
Commits (one per issue):
Verification (certified base build-e0, stamp be4676f11 clean):
No effect numbers in this PR (gate closed until E1 opens it).