Seven bugs of one shape (#4152, #4154, #4156, #4164, #4180, #4182, #4188) were each
found by diffing two builds of the same tree by hand: a checkout path leaking into an
id, a rebuild writing a different graph than the first build, CRLF ids differing from
LF, an edge to a node that is never declared. Each fix got its own narrow test, so the
next extractor or write-path change can bring the same class back unseen.
tests/test_graph_invariance.py builds the whole tests/fixtures corpus (every extractor)
through the real CLI, --no-cluster and clustered, and checks: two folders give the same
graph, the checkout path appears nowhere in graph.json, a rebuild of the unchanged tree
changes nothing, LF and CRLF give the same graph, and every raw edge endpoint is declared.
On 0.9.79 the three checks those fixes cover fail; on 0.9.80 all 12 pass in about 20 s.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B8gwEpjajiWHVW3c9smuKf
(cherry picked from commit 4293a638d4)
