**Related issues:** Resolves #50068, Resolves #50106, Resolves #50107, Resolves #50108, Resolves #50110, Resolves #50114 Follow-on fixes from QA of #41470 (Python script-only packages): - Software-installer validation errors are action-neutral, so the Add and Edit flows each show the correct single verb, and the unsupported-file error names a content/format mismatch instead of blaming the extension (#50068, #50107). - `.py` packages accept `setup_experience_platform` (`darwin`/`linux`), matching `.sh` (#50106). - A failed-to-run install script (exit code `-1`) now renders a diagnostic instead of empty output, and orbit surfaces the underlying execve error (#50108). - The install-rejection message for `.sh`/`.py` packages says "macOS and Linux hosts" instead of "linux" (#50110). - Orbit writes each script's temp file with an extension matching its shebang (`.py`/`.sh`/`.ps1`), so tracebacks reference the right file type (#50114). # Checklist for submitter - [x] Changes file added for user-visible changes in `changes/`. ## Testing - [x] Added/updated automated tests - [x] QA'd all new/changed functionality manually ## fleetd/orbit/Fleet Desktop - [x] If the change applies to only one platform, confirmed that `runtime.GOOS` is used as needed to isolate changes. - [x] Verified compatibility with the latest released version of Fleet (orbit-only change; the server↔agent `SoftwareInstallDetails` contract is unchanged). <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Bug Fixes** * Improved installer validation and rejection messaging for unsupported/invalid package contents (including correcting “add” vs “edit” wording and avoiding duplicated phrasing). * Added clearer diagnostics when install scripts fail to start (including empty output cases). * Corrected handling of script-only packages so Python scripts use the proper script type/extension, reducing misleading tracebacks. * Updated platform availability messaging so `.sh`/`.py` packages display macOS+Linux support. * **New Features** * Python script-only packages can now specify macOS and Linux setup experience platforms. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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