Extend VS Code fork storage detection

[OliverBennettdev]

Summary

• extend VS Code globalStorage probing with Cursor Nightly, Windsurf Next, Trae, Void, and Positron
• add Bun regression coverage for every supported VS Code variant across the two extension-backed tools (Cline and Roo Code)
• run bun test in CI so the coverage cannot silently drift

Root cause

vscodeExtensionStorageExists() already handled the shared globalStorage layout correctly, but VSCODE_VARIANTS was a fixed list that stopped at Code, Code Insiders, Cursor, VSCodium, and Windsurf. Newer forks were therefore never probed.

Issue

Closes #40

Validation

• final diff is limited to the variant list, one regression test file, and the CI test step
• regression logic was checked against both Cline and Roo Code: the previous list misses 10 cases (5 new variants × 2 tools), while the updated list misses 0
• the new TypeScript test file parses successfully with Node 22 type stripping
• upstream GitHub Actions created CI run 31895722019, but it is action_required with no jobs because this fork PR needs maintainer approval before Actions can execute

The PR remains a draft until the upstream CI approval/run is available.

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