Port upstream CodexBar 0.56.1 [review]

[Finesssee]

Review status

Review only. Do not merge until explicit approval.

Fresh review PR replacing the previously merged-and-reverted #422 state.

This review branch was rebuilt from current main as a clean stack. Its tree was verified byte-for-byte identical to the already-validated local port tip for 0.56.1, so rebuilding the ancestry did not change implementation content.

Stack

• Head: $(System.Collections.Hashtable.head)
• Base: $(System.Collections.Hashtable.base)
• Next version PR, if any, stacks on this branch.

Validation evidence

Porting work was reviewed with local Codex CLI gpt-5.6-luna:max workers and Thermo-style structural checks. The final 0.56.7 stack is clean and passes:

• Rust cargo fmt --check
• git diff --check
• cargo metadata
• Frontend: 57 files / 328 tests
• TypeScript sc --noEmit
• Vite production build
• Locale parity: 825 keys
• Interaction guard: 9/9

Native Rust test/check execution on the local Windows host is blocked before project linking because the host resolves the wrong GNU/Unix link.exe; this is an environment validation limitation, not a proven semantic porting defect.

Merge policy

Please review this PR and the full stack first. Do not merge yet.

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