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* fix: safety guard incorrectly blocks commands with URLs The absolutePathPattern regex was matching URL path components like //github.com as file system paths, causing commands containing URLs to be incorrectly blocked by the workspace restriction safety guard. For example, 'agent-browser open https://github.com' would be blocked because //github.com was treated as an absolute file path outside the working directory. The fix adds a check to skip any path match that starts with '//', as these are URL path components, not file system paths. Fixes #1203 * fix: handle file:// URIs correctly in safety guard The previous fix skipped all paths starting with '//', which incorrectly also skipped file:// URIs that could escape the workspace sandbox. Changes: - Only skip '//' paths when preceded by web URL schemes (http:, https:, ftp:, etc.) - file:// URIs are now properly checked against workspace boundaries - Added TestShellTool_FileURISandboxing to verify the fix Fixes security issue raised by @alexhoshina in PR #1254 * style: fix gofumpt formatting * fix(safety-guard): use exact match position to prevent URL exemption bypass Using strings.Index(cmd, raw) always returned the first occurrence of the matched substring, allowing a bypass where the same //path appeared both inside a URL and as a standalone shell path (e.g. echo https://etc/passwd && cat //etc/passwd would skip the second match). Switch to FindAllStringIndex so each match is evaluated at its actual position in the command string. Adds TestShellTool_URLBypassPrevented to cover the exploit scenario.