Vendor the 206 official YAML test suite cases (yaml/yaml-test-suite, data branch, commit 6ad3d2c) that PureYAML does not yet handle correctly, under Tests/Fixtures/yaml-test-suite/, with a manifest recording each gap's category and current behavior.
Add an opt-in conformance sweep (scripts/check-yaml-test-suite.sh, gated behind PUREYAML_RUN_YAML_TEST_SUITE=1) that reproduces every recorded gap, so a future fix must update the manifest. Document the measured result (196/402 passing) and the ordered plan for closing the gaps in docs/YAML_TEST_SUITE_CONFORMANCE.md.
No parser behavior changed.
Mihaela Mihaljevic
13a3859e21