$ cp -r examples/ch01/variance-bridge /tmp/variance-bridge
$ sed -i 's#`skills/revenue-bridge/references/definitions.md`#`../_shared/source-trace/SKILL.md`#; s#`skills/revenue-bridge/scripts/bridge.py`#`skills/revenue-bridge/scripts/bridge2.py`#' /tmp/variance-bridge/skills/revenue-bridge/SKILL.md
$ python3 tools/validate_pack.py /tmp/variance-bridge
/tmp/variance-bridge: FAIL (bundle, 6/20 files, 17416 bytes below the root)
  error: skills/revenue-bridge/SKILL.md: spec 3.4.1: path `skills/revenue-bridge/scripts/bridge2.py` does not exist relative to the pack root
  error: skills/revenue-bridge/SKILL.md: spec 3.4.2: `../_shared/source-trace/SKILL.md` climbs out with '..'; paths are relative to the pack root
  error: skills/revenue-bridge/SKILL.md: spec 3.4.4: script `skills/revenue-bridge/scripts/bridge.py` is not named in backticks; write its path from the pack root once in backticks, without the placeholder, so the path is checked
exit 1
