An id whose canonical stem contains its legacy stem as a prefix (parent
dir name == file stem, e.g. .claude/CLAUDE.md) re-matched the legacy
branch every build and grew another stem segment, defeating the
same_topology/no_change short-circuits and churning graph.json +
clustering on every zero-delta update. Skip an id that already carries
its canonical stem (mirrors graph_has_legacy_ids); genuine legacy
migration still applies. Also records the #1889/#1918 query-scoring perf
work in the changelog.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
A node whose source_file equals the absolute scan root (e.g. a project-level
semantic concept the LLM attributed to the whole repo) relativized to Path('.'),
and _semantic_id_remap fed that into _file_stem, whose path.with_suffix("")
raises `ValueError: '.' has an empty name`. The crash landed in final graph
assembly — AFTER all LLM extraction cost was spent — writing no graph.json at
all, and leaving `cluster-only` to then report "no graph found".
Two guards: _file_stem returns "" for a name-less path (protects every caller,
not just this one), and both _semantic_id_remap passes skip a root-equal
source_file explicitly (it has no per-file identity to remap — id left
untouched). Reported with a minimal LLM-free repro by @sub4biz.
Not a 0.9.5 regression: _semantic_id_remap/_file_stem are byte-identical to
0.9.4; the latent path was only hit when dedup produced a root-source_file node.
4 regression tests (dot-path stem, remap no-crash, build_from_json with a
root-level concept node, normal remap unaffected). Full suite 2849.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
