orgloop doctor: env vars in script: paths not expanded during validation

[odink-kindo]

Bug: orgloop doctor does not expand env vars in script: path validation

Version

orgloop 0.7.8

Description

When a transform uses an env-var-anchored script: path (e.g. ${ORGLOOP_PROJECT_ROOT}/scripts/foo.sh), the doctor validation reports "Script not found" even when the env var is set and the script exists on disk.

The error message contains the unexpanded literal ${ORGLOOP_PROJECT_ROOT} rather than the resolved path, confirming the validator skips env-var substitution:

✗ transform: skip-sean-branches — Script not found: ${ORGLOOP_PROJECT_ROOT}/scripts/skip-sean-branches.sh

The script is present at the resolved path and loads correctly at runtime; only the doctor check is broken.

Reproduction

1. Set ORGLOOP_PROJECT_ROOT=/path/to/project in your module's .env
2. Add a transform with script: ${ORGLOOP_PROJECT_ROOT}/scripts/myscript.sh (where the script exists)
3. Run orgloop doctor (with the env loaded)
4. Doctor reports "Script not found: ${ORGLOOP_PROJECT_ROOT}/scripts/myscript.sh" despite the file existing

Workaround

orgloop start --daemon --supervised --force bypasses the doctor check. Runtime script execution works correctly.

Expected behaviour

The doctor should expand env vars before stat-checking script paths, consistent with how the runtime resolves them.