board: #1530 and #1531 merged — arc entries, LATEST_STATE, D-PROD-V4 row

[AdaWorldAPI]

Board entries for the two merged PRs:

• PR_ARC_INVENTORY: an entry for build: symbiont and cognitive-stack clone ndarray master #1531 (crate images clone ndarray master on Rust 1.99) and an entry for board: #1529 merged (D-PROD-V4) #1530. board: #1529 merged (D-PROD-V4) #1530 needs its own entry because it was not only board work: it also fixed both thinking-engine images. They now build v4 with --target <host triple>, clone ndarray, use Rust 1.99, and build the playground example the runtime stage copies.
• LATEST_STATE: the header now lists board: #1529 merged (D-PROD-V4) #1530 and build: symbiont and cognitive-stack clone ndarray master #1531, plus one bullet on the images.
• STATUS_BOARD: the D-PROD-V4 status cell now names the three merges.

This PR contains board entries only, so under the termination clause it needs no arc entry of its own. entries_index.py --check passes.

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-13T12:28:54.573909Z	0987e11	Draft marked ready

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