Add quality criteria registry

docs/quality-criteria/README.md

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+# Quality Criteria Registry
+
+`acceptance-quality-criteria.v1.json` is the active reviewable criteria registry
+for candidate characteristics. It defines criteria that deterministic gates may
+use to reject, downgrade, invalidate, flag, merge, or require review.
+
+The registry is intentionally not an approval policy. Approval belongs to human
+reviewers or trusted agentic reviewers that inspect evidence and record a
+rationale.
+
+List the active registry from the CLI:
+
+```bash
+repo-scoping list-quality-criteria --format markdown
+```
+
+The same registry is available from the API at `GET /quality-criteria`.