fix(workspace): enforce file extension whitelist on all writes + block executables (issue #28) - #41
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…k executables (issue #28) - Add 'text' fileType with safe extensions (.md, .txt, .json, .csv, etc.) - Make fileType parameter required with 'text' default in validateWritePath - Add BLOCKED_EXTENSIONS list (.exe, .dll, .bat, .cmd, .sh, .ps1, etc.) that is always rejected regardless of fileType - Add extensionToFileType() helper to auto-detect type from extension - Update all call sites to pass appropriate fileType: - WebUI write endpoint → 'text' - Agent workspace_write → auto-detected via extensionToFileType() - download-binary → auto-detected from filename extension - download-media → auto-detected from filename extension - Update validator tests: 79 tests covering blocked extensions, default text enforcement, and fileType-specific validation Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Fixes #28