fix(gates): require .deed, not the deprecated .a2ml

[hyperpolymath]

What breaks today

dogfood-gate.yml counts .a2ml files and nothing else, so a repo whose only manifest is a
.deed document gets ::warning::No .a2ml manifest files found, and the summary step is
skipped by the same predicate. The gate is checking for a grammar the estate has deprecated.

Authority for the new wording

• deed-ecosystem/README.adoc: "The DEED format name and .deed extension are final, not A2ML."
• rsr-template-repo ships rsr-template-repo_chora.deed and bootstraps with just repo-init;
  the removed a2mliser init instruction points at neither.
• hyperpolymath/accessibility-everywhere already carries this exact migrated form, so this PR
  converges a stale copy rather than introducing a new convention.

Deliberately not touched

• .machine_readable/*.a2ml and any gate reading a real retained file: their own README scopes
  the rename away from "retained A2ML v1 material". Rewriting those inputs would fail gates that
  currently pass.
• validate-a2ml.sh hook filenames and the validator's own Validate A2ML Manifests step name
  (names, not grammars).

Part of the estate-wide .deed gate migration, 2026-09-21.

[coderabbitai]

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