release: stage Jina embedding migration for 0.2.5851

[justrach]

Summary

• make jinaai/jina-embeddings-v2-base-code the managed 512D model for new CodeDB clients
• keep the legacy Qwen query encoding isolated by model and vector-space id
• require an explicit semantic-index rebuild so incompatible vectors are never mixed
• update CLI/docs/release metadata for 0.2.5851

Older released clients continue to send Qwen/Qwen3-Embedding-0.6B; the deployed edge keeps that route live while 0.2.5851 clients use Jina.

Validation

• zig build test
• MCP E2E: 76/76
• native Windows Server 2025 release matrix: fresh index, 0.2.5841 upgrade, checked-in smoke all pass
• macOS 0.2.5851 semantic-index: Jina 512D sidecar built successfully
• macOS hybrid context: local OpenPuffer ANN loaded and remote Jina query succeeded
• public edge/origin dual-route matrix: omitted/Qwen/Jina pass; public Qwen 4B rejected

Cloud counterpart: justrach/codedb-cloud#50 (merged and deployed).

[chatgpt-codex-connector]

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Reviewed commit: a6e4a612ff

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[chatgpt-codex-connector]

Bump the npm launcher to the release version

When this release sets the native version to 0.2.5851, npm/package.json remains at 0.2.5850. I checked .github/workflows/npm-publish.yml: it publishes the version read directly from that manifest, so the 0.2.5851 publish will instead attempt to republish the already-existing codedeebee@0.2.5850 and fail; additionally, npm/scripts/postinstall.js derives the GitHub release tag from that same version. Update the npm manifest alongside the native release metadata.

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-31T16:49:23.757261Z	a6e4a61	PR opened

ℹ️ About Codex in GitHub

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