docs(docs): MLZOO index — mark D as PRP-31 (#280)

[w7-mgfcode]

Summary

• All six MLZOO PRPs are now merged (A → PRP-29, B → PRP-30, B.2 → PRP-MLZOO-B.2, C1 → PRP-MLZOO-C1, C2 → PRP-MLZOO-C2, D → PRP-31).
• The roadmap in PRPs/INITIAL/INITIAL-MLZOO-index.md still labelled D as "Future PRP" — patched to PRP-31 so the table reflects landed state.

Test plan

• Docs-only diff — no code paths touched, no CI gates beyond markdown lint.

Summary by Sourcery

Documentation:

• Correct MLZOO index documentation to label INITIAL-MLZOO-D as PRP-31 rather than a future PRP.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the MLZOO PRP index doc to reflect that MLZOO-D has now landed as PRP-31 instead of being labeled as a future PRP.

File-Level Changes

Change	Details	Files
Align MLZOO index roadmap table with current PRP numbers by marking MLZOO-D as PRP-31.	Update the roadmap table entry for MLZOO-D to reference PRP-31 instead of "Future PRP". Keep surrounding PRP mappings (A, B, B.2, C1, C2) unchanged to preserve existing context.	PRPs/INITIAL/INITIAL-MLZOO-index.md

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