release: v0.2.5850 concurrent warm queries

[justrach]

Summary

• bump CodeDB and codedeebee to 0.2.5850
• document the bounded eight-way POSIX warm-query dispatcher and measured multi-agent improvement
• fix the optimized detached-worker cleanup ordering found by the release E2E gate
• preserve zero-touch hybrid defaults and document the Windows boundary

Validation

• zig build test --summary all: 263 passed, 4 skipped
• optimized issue-690 live-refresh scenario: 5/5 consecutive passes
• optimized MCP E2E: 76/76 passed
• default hybrid smoke: 8 concurrent requests, 8/8 successful, with endpoint/token overrides removed
• npm pack --dry-run: codedeebee@0.2.5850
• git diff --check and release-file formatting checks passed

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-29T04:56:21.412225Z	b5d8628	PR opened

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