Windows: index worker crashes (0xC0000005) in parallel.extract on whole mixed C#/Vue repo; each sub-folder indexes fine alone #2785

Summary

On Windows, index_repository on a mixed C# / Vue / JS / Markdown / SQL repo (~990 files after ignores) ends with index worker ended with crash (exit=-1073741819) (0xC0000005, access violation) during parallel.extract. Every top-level sub-folder of the same repo indexes fine on its own; only the whole-repo index crashes. This looks similar in shape to #2349 (each package alone is fine, only the union crashes), but the signature differs: Windows, access violation, extract phase.

Environment

• codebase-memory-mcp 0.12.1 (install.ps1, --skip-config, checksum verified)
• Windows 11 Pro 10.0.26300, amd64
• Repo: .NET Framework 4.8 solution (ASP.NET WebForms + WebApi, several C# projects), Vue 2 single-file components without a bundler, plain JS/CSS, SQL scripts, Markdown docs. Private repo, so I can't attach it.

What I ran

codebase-memory-mcp cli index_repository --repo-path <repo root>, with and without --mode fast.

Result

Notes:

• The files that were started but not finished when the worker died differ between runs, so I don't think one specific file triggers it.
• The two env vars come from strings in the binary, not from the docs. The worker log still shows parallel.extract after setting them, so they may be no-ops here.
• The first lines of stderr are always mem.allocator.preloading_completed still_preloading=false detail=allocator_was_still_preloading,_so_arena_creation_and_purging_were_disabled. Not sure if related.
• Last log lines before the crash are parallel.extract.file.start ... / ...file.done ... / parallel.extract.progress done=N total=M, with N around 110 to 150 of ~990 to ~1190 depending on the ignore set.

Expected

The whole-repo index completes, as each part does alone.

Questions

• Is there a supported way to get a crash dump or a more verbose extract-phase trace on Windows (CBM_DIAGNOSTICS?) that I can attach?
• Is a Windows-specific allocator/arena problem under parallel.extract a known thing?