The previous commit broke `./lint_python.sh` from the repo root. That path
is a symlink into meta/, and `dirname` does not resolve symlinks, so
SCRIPT_DIR became the repo root and the new `source "$SCRIPT_DIR/lib/..."`
line pointed at a lib/ that does not exist -- an instant exit under
set -euo pipefail.
The bug was latent before the split: the same unresolved SCRIPT_DIR only
fed PROJECT_ROOT, so a root-path run degraded quietly. Adding a source
line is what turned a wrong value into a hard failure.
It was invisible because every check I ran used `bash meta/lint_python.sh`
-- the one entry point that could not fail. Both paths are now verified:
`./lint_python.sh` exits 0 through the symlink, and the direct invocation
still diffs byte-identical against the pre-split baseline. No CI job, hook
or wrapper calls it, so nothing automated was broken in the interim.
Recorded in docs/shell-split-verification.md as its own trap, with the
commands to enumerate a script's other entry points before splitting it.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011w2Pj4Ek3ZNMQVYcFHgXDY
