Submitters only saw a stale 5-point summary on the catalog page (it even listed
a 'Released' requirement nothing enforces), while reviewers applied ten README
rules plus criteria written nowhere public (credentials, approvals, disclosure,
compatibility metadata, forks of bundled plugins).
- plugin-catalog/README.md: rules 11-15 write down those review criteria; the
rule list sits between admission-rules markers.
- New developer-guide page 'Submitting to the plugin catalog': before you
submit, the PR flow, the full rule block (verbatim mirror), pin updates,
delisting vs removal, asking for a hook.
- The /plugins 'Submit' links and the user-guide section point at it.
- tests/website/test_catalog_rules_mirror.py fails when the two rule blocks
differ; classify_changes makes a README-only edit run it.
- AGENTS.md, plugins/AGENTS.md and CONTRIBUTING.md reference both files.
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