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2b32b5b75c
Fixes #13219 Screen file actions intentionally retain their temporary directory so the generated path remains valid after dispatch. The directory and parent handles were retained with it, while TempDir.deinit also left the parent handle open. Each successful action leaked two descriptors. Repeated screen, scrollback, or selection writes could exhaust the process descriptor limit and prevent new PTYs, tabs, and windows from opening. Give TempDir an exhaustive close mode that either deletes or retains its contents while always releasing both handles. Defer screen-file cleanup, retaining only after successful dispatch, and cover both lifecycle paths with descriptor tests.