#1649: detect_incremental tracks the converted markdown sidecar, and
convert_office_file early-returned whenever the sidecar existed — so a .docx/
.xlsx edited after its first conversion never updated its sidecar and was
reported "unchanged" forever, freezing the graph. It now re-converts when the
source is newer than the sidecar (bumping the sidecar so the hash check catches
it); an unchanged source still skips the rewrite (#1226).
#1655: _md5_file/save_manifest/count_words used plain open()/stat(), which the
Windows file APIs reject for absolute paths over 260 chars unless prefixed with
`\\?\`. Deeply-nested files never hashed, their manifest entry never stabilized,
and detect_incremental re-flagged them as changed every run. A new _os_path adds
the extended-length prefix on win32 for change-detection I/O (mirror of
cache._normalize_path, which strips it for keys). No-op elsewhere.
#1656: detect() re-parsed every PDF/docx/text file to size the corpus on each
run. Word counts are now memoized in the existing content-hash stat index (keyed
by size + mtime_ns), so an unchanged file is parsed once. file_hash's fastpath is
guarded so a word-count-only entry (no hash) can't KeyError, and both writers
augment a co-located entry in place instead of clobbering the other's field.
Full suite: 2906 passed, 3 skipped.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
safishamsi