* fix: materialize skill resources to disk for subprocess access
Skill-bundled scripts stored in skill_resources were loaded into memory
but never written to disk, causing FileNotFoundError when the model
tried to execute them. Write resources to a per-workstream temp directory
on skill load, expose via SKILL_RESOURCES_DIR env var and PATH, clean up
on skill change or session close.
* fix: pre-flight validation warns when skill references missing resources
Scan rendered skill content for path references (scripts/foo.py, etc.)
and compare against bundled skill_resources. Warn via on_info if any
referenced paths are not bundled, so operators see the gap at skill
activation rather than at runtime FileNotFoundError.
* fix: address PR #271 review feedback
- Fix trailing colon in PATH when $PATH is empty (cwd-on-PATH risk)
- Move try/except inside per-resource loop so one bad write doesn't
abort all resources
- Explicit encoding="utf-8" for deterministic writes across locales
* fix: address PR #271 review round 2
- Normalize available paths in _validate_skill_resources() to match
referenced paths (both sides use os.path.normpath now)
- Fix flaky traversal test: assert inside base dir, not escaped path
Patrick Buckley