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ead9643e82
13th recipe. embedding-3 (current) + embedding-2; 1024 default dims with Matryoshka options [256, 512, 1024, 2048]. OpenAI-compatible at open.bigmodel.cn. embedding-3 at 2048 dims exceeds pgvector's HNSW cap of 2000 — those brains fall back to exact vector scans via the existing chunkEmbeddingIndexSql policy at src/core/vector-index.ts. Default stays at 1024 (HNSW-fast); users who want maximum fidelity opt into 2048 via --embedding-dimensions and accept the slower retrieval. Tests pin the HNSW boundary: 1024 returns the index SQL, 2048 returns the skip-index/exact-scan SQL. Tests: bun test test/ai/ — 112/112 (6 new + 106 prior). Plan: ~/.claude/plans/ok-lets-turn-this-enumerated-sonnet.md (commit 7 of 11). Reworked from #59. Together with DashScope (commit 6), closes the China-region embedding gap users repeatedly reported (DashScope covers Alibaba, Zhipu covers BigModel; both ship with international endpoints by default). Co-Authored-By: Magicray1217 <267836857+Magicray1217@users.noreply.github.com> Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>