fix(embed-candle): address round-1 review

- commit track-spec + meta-spec/plan into branch (HIGH: dangling `amends:` ref)
- inline parity evidence (cosine 1.0, max_abs_diff 2.01e-7) into HOTFIXES +
  release notes; drop refs to deleted IMPL_REPORT/SPIKE_REPORT (MEDIUM)
- model guard: reject non-e5-large `model` before the 2GB download so
  model_id() can't mislabel vectors (MEDIUM) + unit test
- parity test now covers BOTH query: and passage: prefixes (MEDIUM)
- guard encodings.first() index; document zero-attention/pooling invariant;
  clarify embed_batch prefixing doc (LOW)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/release-notes/v0.22.0-draft.md

@@ -69,4 +69,6 @@ double-free 경로를 원천 차단한다. NUMA 노드 바인딩이 더 필요
 
 듀얼소켓 NUMA 서버에서 `provider=candle` 로 5150-doc ingest 가 double-free
 없이 EXIT=0 완주하는지가 본 release 의 최종 인수 게이트다 (meta-spec §4.3).
-패리티 max abs diff 수치는 `IMPL_REPORT.md` 참조.
+패리티(candle vs onnxruntime): cosine_min = 1.000000, 차원별 max 절대오차 =
+2.01e-7 — 벡터가 사실상 동일하므로 `embedding_version` 유지(재색인 0). 재현은
+`crates/kebab-embed-candle/tests/parity.rs` (`--ignored`).