fix(gates): gate on the DEED grammar, per the template and standards#837

[hyperpolymath]

Why

The guard in dogfood-gate.yml counted .a2ml files only:

COUNT=$(find . -name '*.a2ml' -not -path './.git/*' | wc -l)

so a repo whose manifest is written in the current grammar is reported as having none, and the
summary/compliance row is skipped by the same predicate (if find . -name '*.a2ml' ... | grep -q .).
The validator itself has scanned both grammars for a while -- the caller's predicate is the bug.

Authority

• rsr-template-repo/.github/workflows/deed-validate.yml (the mint source) is what this wording is
  copied from, byte for byte, including -type f-free find and the dual-accept stance.
• standards#837 — "DEED conversion campaign", campaign step 4: *"flip ... RSR gates from .a2ml
  presence to .deed presence alongside". Gate predicates, not document contents.
• deed-ecosystem/README.adoc: "The DEED format name and .deed extension are final, not A2ML."

Deliberately not done

• No .a2ml file is translated or renamed. #837 makes classification into the four DEED forms and
  per-family mapping specs a prerequisite for mass translation; that is not this PR.
• No gate that reads a retained file is touched (CLAIMS.a2ml, .machine_readable/Debtfile.a2ml,
  contractiles/INDEX.a2ml); rewriting those would fail gates that currently pass.
• No job-id or shell-var renames (a2ml-validate, A2ML_COUNT): they are referenced from needs:
  and ${{ needs.*.outputs }}. The Checks-UI label is updated, as it has no references.

Estate-wide .deed gate convergence, 2026-09-21. Script: estate-audit/engine/deed_gate_migration.py.

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• .github/workflows/dogfood-gate.yml

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