task: Windows platform issues (8 bugs)

[DeusData]

Scope

Umbrella tracker for Windows-specific bugs across install, indexing, path handling, and search. The wide-char API work (PR #386) and cmd.exe-compatible pipeline syntax (PR #325) cover subsets — this task tracks the remaining gaps and serves as a place to file Windows regressions.

Sub-issues

• "install" command does not work for opencode in windows 11 #221 — "install" command does not work for opencode in windows 11
• Windows: mapped drive path fails with bad_root_path/store.corrupt, local path works #227 — Windows: mapped drive path fails with bad_root_path/store.corrupt
• Directory structure is not being read correctly on Windows #266 — Directory structure is not being read correctly on Windows
• .cbmignore patterns silently ignored on Windows #274 — .cbmignore patterns silently ignored on Windows
• Indexing repository unexpectedly indexes C:/Users/{USERNAME} instead of selected repo path (security/privacy risk) #331 — Indexing repository unexpectedly indexes C:/Users/{USERNAME} (security/privacy risk)
• Crash when indexing a repository #347 — Crash when indexing a repository (Windows, 0xc0000005)
• search_code returns 0 results on Windows post-#310: Select-String via _popen fails silently #348 — search_code returns 0 results on Windows post-feat(mcp): add Windows support for code search via PowerShell #310: Select-String via _popen fails silently
• index_repository silently deletes DB on Windows when repo path is on a mapped SMB drive (drive letter) #367 — index_repository silently deletes DB on Windows when repo path is on a mapped SMB drive

Acceptance

1. CI runs Windows smoke tests for: ASCII paths, non-ASCII paths (covered by PR fix(windows): use wide-char API for non-ASCII path support #386), mapped network drives, UNC paths, paths with spaces, paths with & / ( / ).
2. .cbmignore parsing matches POSIX behavior on Windows.
3. No crashes on Windows for repos that index successfully on Linux/macOS.
4. The privacy-critical Indexing repository unexpectedly indexes C:/Users/{USERNAME} instead of selected repo path (security/privacy risk) #331 (wrong path indexed) has a defense-in-depth test that asserts the resolved repo path is contained within the originally requested directory.

Why one task

Windows-specific bugs share infrastructure (path normalization, process spawning, wide-char API surface). Tracking them together avoids partial fixes that regress on adjacent code paths.