Carry producer cancellation separately from physical launch errors and diagnostic causes. Retain exact opaque reasons, LaunchSupport warnings, and rollback owners; consume the authored outcome without reclassifying failed launches from a later deadline.
Validation: focused client/provider/rollback and helper/MCP tests, check:fast, docs:check. Controlled native process ownership and Node bridge only; real Ghidra/JVM and Windows/Linux fault behavior unverified.
Refs #4517
Refs #4502, #4506, #4508, #4518, #4522, #4526.
Retain snapshot, endpoint, launch rollback and compiler cleanup owners. Join request finalization and cleanup cancellation. Preserve bounded compiler output and original byte counts through capture and Ghidra failures. Normalize execFile cancellation once at its producer.
Validation includes real macOS Ghidra TCP MCP success workflows, controlled Node compiler/process fault fixtures, focused regressions and static checks. Native Swift compiler faults, Windows execution and stdio transport were not verified. Broader startup primary classification in #4517 and native adapter propagation remain unfinished.
morluto