docs(board): harvest Path C (ndarray::simd) + super-domain subcrates + API-drift + OGIT-axis orthogonality

5 new prepended entries across the three governance files capturing
findings from rapid 2026-05-13 brainstorming:

EPIPHANIES.md (4 new entries, all 2026-05-13):
- THREE-paths-converging (extends the two-paths entry) — Path C =
  `ndarray::simd` canonical SIMD compute substrate per spec §19.2;
  per-row hot path correctly scalar, batch paths should route through
  ndarray::simd (`LazyLock<Tier>` dispatch, gather_u8, xor_fold, etc).
- super-domain-as-subcrate finding — each SuperDomain variant IS its
  own specialised subcrate; Tier C "consumer crate scaffolding" is
  specifically "super-domain subcrate scaffolding"; medcare migration
  is the proof case (3 crates → 1 healthcare re-export).
- API drift mid-flight — medcare-rs failing during migration because
  D-SDR-1..5 grew the UnifiedBridge API in 5 steps over 7 days;
  5-step operational mitigation (SHA pinning + must_use lint +
  deprecation + migration module + CHANGELOG).
- OGIT-axis orthogonality clarification — the §1-§2 "4-level
  hierarchy" framing is partially misleading; SuperDomain × OGIT-basin
  × OWL-leaf × DOLCE-leaf are orthogonal axes, not strictly nested.
  Implications for per-row identity (6 bytes carry OWL only) vs
  column-side metadata (DOLCE / Foundry / Wikidata) and for
  masked-predicate composition (identity-axis predicate separate from
  upper-ontology-axis predicate).
- §16-§19 correction — most was already delivered in PRs #355-#363+
  (sprint-2 + sprint-3 + super-domain spec authoring). Outstanding
  work is composition + implementation of designs that exist; this is
  a morale + scope correction.

IDEAS.md (1 new entry):
- super-domain subcrate scaffolding cascade — 5-PR sequence (MedCare
  finalization → smb-bridge retrofit → woa-rs extraction → hiro-rs
  new → hubspot-rs new) that ships per-super-domain subcrates with
  manifest entries. Depends on Pattern E+F+cognition cascade.

TECH_DEBT.md (3 new TD rows):
- TD-API-DRIFT-MIDFLIGHT-1 (P0): consumer migrations blocked TODAY by
  API drift; needs operational discipline mitigation.
- TD-SUPER-DOMAIN-SUBCRATES-1 (P1): 5 super-domain subcrate slots,
  medcare in-flight, smb in-flight, 3 not started.
- TD-SIMD-CALLCENTER-BATCH-PATHS-1 (P2): batch hot-spots still
  scalar-loop where ndarray::simd is canonical (§19.2).

https://claude.ai/code/session_01PjcbSTd9zdVPkta9qwkVKo

Author: claude