When gsd-tools init output exceeds 50KB, core.cjs writes to a temp file
and outputs @file:<path>. No workflow handled this prefix, causing agents
to hallucinate /tmp paths that fail on Windows (C:\tmp doesn't exist).
Add @file: resolution line after every INIT=$(node ...) call across all
32 workflow, agent, and reference files.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>