Runtime startup pruning command capture; no tests or mocked platform/services

CASE path-discovery | Linux x64 | fresh synthetic T3 home | real CLI after
A=0.0.1 fixture (copy of built executable); B=0.1.8 from commit under test
A initially inside one-hour grace; B settled; stopped service definition and genuine launcher name B
START discover-A-on-PATH: real built CLI B; PATH includes A directory
Server listening on loopback; runtime versions: 0.0.1, 0.1.8
Launcher records: <sandbox>/bin/t3
STOP: captured server process exited; no A process was started
Age A installation sentinel beyond one hour; remove A directory from PATH
START prune-obsolete-A: real built CLI B; PATH contains genuine launcher to B
Server listening on loopback; runtime versions: 0.1.8
Launcher records: <sandbox>/bin/t3
[09:06:51.869] INFO (#578): Removed unused t3 runtimes.
  { versions: [ '0.0.1' ] }
STOP: captured server process exited; no A process was started
OBSERVED A REMOVED

CASE historical-record | Linux x64 | fresh synthetic T3 home | real CLI after
A=0.0.1 fixture (copy of built executable); B=0.1.8 from commit under test
A settled; historical own-entry record names A; service names B
START prune-obsolete-A: real built CLI B; PATH contains genuine launcher to B
Server listening on loopback; runtime versions: 0.1.8
Launcher records: <sandbox>/t3-home/runtime/versions/0.0.1/t3; <sandbox>/bin/t3
[09:07:00.044] INFO (#904): Removed unused t3 runtimes.
  { versions: [ '0.0.1' ] }
STOP: captured server process exited; no A process was started
OBSERVED A REMOVED

CASE stopped-service | Linux x64 | fresh synthetic T3 home | real CLI after
A=0.0.1 fixture (copy of built executable); B=0.1.8 from commit under test
A settled; stopped service definition names A
START prune-obsolete-A: real built CLI B; PATH contains genuine launcher to B
Server listening on loopback; runtime versions: 0.0.1, 0.1.8
Launcher records: <sandbox>/bin/t3
STOP: captured server process exited; no A process was started
OBSERVED A RETAINED
Observed remaining A: {"path-discovery": false, "historical-record": false, "stopped-service": true}