conflict-proof shared docs: oracle-assumptions register as one file per entry (generated summary table), entry IDs allocated at issue time #4788

Owner-approved efficiency work (2026-10-09). docs/language_status/oracle_assumptions.md is one large hand-edited file. Parallel PRs collided on its summary table and on entry numbering (X30/X31/X32 on 2026-10-09: #4762, #4766, #4773). Every slice needed a merge from main plus a re-render.

Change:

• One file per entry (e.g. docs/language_status/register/X31.md, with front-matter for the status and the summary line).
• The summary table and the combined page are generated by a tool and checked in CI, like other generated pages.
• A tiny allocator, register.py next X, plus the rule "take the ID when the issue is filed", so parallel PRs never pick the same number.
• Migrate the existing entries without any content change.

Acceptance:

• Two PRs adding entries in the same family no longer conflict.
• The combined page is byte-identical to today's content, apart from ordering and format.
• Links still resolve.

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