Relocate check_docs, check_adrs, and docs_rules; update CI, tests, and docs.
Restore docs/adr to main; add check_adrs.py CI gate so existing ADR-*.md files cannot be modified — supersede with a new numbered ADR instead.
Enforce link resolution, glossary anchors, and readability rules on every push and PR; docs-only pushes to main still run docs-verify while skipping the simulator gate.