Wires scripts/check-doc-links.sh into build-and-test.yml next to the existing
boundary tripwire, and exposes it as `bun run check:links`.
The docs are the maintained source of truth for architecture and process and
cross-reference each other heavily, so a rename that misses a link quietly
turns a doc into a dead end. Pure shell — nothing is installed at job time.
The script itself is landing separately; this job step is red until it does.
dtourolle
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