The overlay fingerprint resolved a node's source_file against
graph_path.parent (the graphify-out/ dir), but source_file is stored
relative to the PROJECT root — so graphify-out/auth.py never existed and
_is_stale flagged EVERY verdict "code changed since — re-verify" the
moment it was written. (The original staleness test used an absolute
source_file, which masked it.)
Fix: resolve the file by trying the likely roots in order (.graphify_root
marker, graphify-out's parent, graph.json's own dir, cwd) and use the
first that exists — the same search at write and read — and fingerprint
file CONTENT only (sha256 of bytes, no path mixed in) so the hash is
root-independent and a committed sidecar stays valid across checkouts.
Drops the brittle directory-name-based root guess.
Adds a regression test with a relative source_file under the graphify-out
layout (stale=False right after reflect, True after an edit).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
