extract.py: clamp ProcessPoolExecutor max_workers to 61 on Windows (issue #1298).
Python's ProcessPoolExecutor hard-caps at 61 on Windows via WaitForMultipleObjects;
>61-core machines crashed on AST extraction. Clamp applied after all input paths
(auto-compute, GRAPHIFY_MAX_WORKERS, --max-workers) to cover all three.
build.py: skip ghost-merge when two AST nodes share (basename, label) key (issue #1257).
When same-named symbols appear in same-named files across directories (e.g. two
render() in two index.ts), last-writer-wins produced an arbitrary canonical node
and mis-pointed all edges. Now tracked in _loc_collisions; ambiguous keys are
skipped in Pass 2, leaving the ghost intact rather than merging into the wrong node.
__main__.py: ignore OSError on unreadable .graphify_version probes (issue #1299).
On restricted-permission installs or network mounts, .exists()/.read_text() raised
PermissionError and crashed every graphify query/explain/path call at startup.
All three FS probes now wrapped in try/except OSError: return.
prs.py: resolve claude.cmd on Windows in prs.py claude-cli backend (issue #1288).
The _call_llm and _call_claude_cli paths were already fixed; prs.py had the same
bare ["claude", ...] call that fails on Windows npm installs with WinError 2.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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