BEFORE: measured runtime evidence
Each launch exited normally with code 0.
Registration helpers exclude unrelated directory-handler queries.

Launch 1: initial launch; registration helpers {'updateDesktopDatabase': 1, 'xdgMimeDefault': 1}
Launch 2: unchanged relaunch; registration helpers {'updateDesktopDatabase': 1, 'xdgMimeDefault': 1}
  desktop entry: mtime_ns 1794370310743384276 -> 1794370354508776677; identical bytes=True; write opens=1
  persistent icon: mtime_ns 1794370313351345085 -> 1794370356429752379; identical bytes=True; write opens=0
  MIME cache: mtime_ns 1794370314753324177 -> 1794370357737735943; identical bytes=True; write opens=0
Launch 3: missing MIME cache; registration helpers {'updateDesktopDatabase': 1, 'xdgMimeDefault': 1}
Launch 4: stale MIME cache; registration helpers {'updateDesktopDatabase': 1, 'xdgMimeDefault': 1}
Launch 5: changed desktop entry; registration helpers {'updateDesktopDatabase': 1, 'xdgMimeDefault': 1}
Launch 6: changed default; registration helpers {'updateDesktopDatabase': 1, 'xdgMimeDefault': 1}
Launch 7: damaged persistent icon; registration helpers {'updateDesktopDatabase': 1, 'xdgMimeDefault': 1}
Launch 8: unchanged after repair; registration helpers {'updateDesktopDatabase': 1, 'xdgMimeDefault': 1}
  desktop entry: mtime_ns 1794370483703539927 -> 1794370513707356968; identical bytes=True; write opens=1
  persistent icon: mtime_ns 1794370485573527472 -> 1794370515087349400; identical bytes=True; write opens=0
  MIME cache: mtime_ns 1794370486778519520 -> 1794370515941344754; identical bytes=True; write opens=0