repo-portable-lint-requires-env-var-path-override

A lint script hard-coded to /root/.claude/skills/ breaks when the repo is cloned elsewhere. The correct pattern is to resolve paths relative to the script’s own location (e.g., Path(__file__).parent.parent / 'skills') with a HELIX_SKILLS_DIR environment variable override for non-standard layouts. Verify both modes before committing: run once with default path, once with HELIX_SKILLS_DIR=/path/to/skills python lint.py.