Completes #1774. The prior fix redirected the AST cache dir to CWD but
file_hash still called _ensure_stat_index(root) without the cache
location, so the hash fastpath's stat-index.json kept anchoring on the
key-root (the analyzed corpus) — leaving a stray graphify-out/cache/
stat-index.json inside a writable foreign corpus even though the AST
cache itself had moved to CWD.
Thread cache_root through file_hash -> _ensure_stat_index (which already
accepts it, #1747). Surfaced by an out-of-CWD parallel-extract edge case:
the leak was masked in the in-process test suite because _stat_index_root
is a set-once module global that an earlier test had already pinned. The
regression test resets that global to simulate a fresh process and
asserts the corpus stays clean while the stat index lands under CWD.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
With no explicit cache_root, extract() wrote graphify-out/cache/ under the
inferred common parent of the inputs — the analyzed source tree — so
scanning a read-only/foreign corpus silently polluted it.
The naive fix (point the root at CWD) breaks two other things that shared
the same parameter: file_hash keys become absolute/non-portable for an
out-of-CWD corpus, and the XAML/C# project-scan boundary would scan CWD
instead of the corpus. So split cache LOCATION from key/id ANCHOR:
load_cached/save_cached gain a cache_root arg for where the dir lives,
while `root` (inferred common parent) still anchors file_hash keys,
source_file relativization, node ids, and the XAML boundary. extract()
now locates the cache at CWD (or cache_root) but anchors on `root`; the
parallel worker tuple carries both. Existing callers passing cache_root
(CLI, watcher) are unchanged.
Adopts @SimiSips's #1802 (the CWD default + the two location tests) and
adds the decoupling plus a regression test that keys stay relative for a
corpus outside CWD — the property the one-line version would have lost.
Co-Authored-By: SimiSips <SimiSips@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
