Mirror the shared Swift rules canon (rules-swift, commit 4ebb892) into
docs/rules-swift/ as a read-only reference alongside the repo's tailored
docs/rules/. PROVENANCE.md records the source, commit, and what was
included or excluded; the upstream repo's own VCS, CI, and lint tooling
is omitted as machinery rather than rule content.
Exclude the vendored tree from the style gate (scripts/check-style.sh)
and the pre-commit hook: the canon's enforcement docs quote the
forbidden attribution phrases to define them, the same reason the
repo's own enforcement files are already excluded.
Add structured validation diagnostics, JSON and Yams comparison gates, and lazy token/event parsing so production behavior is measured without retaining full intermediate parser arrays.
