Replace synchronous Java execution with bounded owned commands. Keep task-scoped readiness observations fresh across later tasks, defer target client prerequisites behind a closeable owner, and join doctor cancellation and cleanup.
Preserve completed physical failures across late cancellation, exact cleanup dependencies and partial observations. Admit target/profile inputs before probing and return typed factory failures instead of unavailable client wrappers.
Validation: 405 focused tests across 24 files, 2 explicit skips; 109 provider/doctor controls rerun after final admission refinement; check:fast and docs:check. Controlled macOS Java-shaped commands and public CLI/MCP workflows; no new JVM/Ghidra or Windows/Linux lifecycle verification.
Measured warm public doctor baseline/candidate: elapsed 0.447/1.223s, CPU 0.624/1.237s, sampled family RSS 379/529MB, reply tokens 3133/3133. Ownership adds cost; no performance improvement claimed. True cold, whole-agent and MCP costs unmeasured.
Refs #4561. Remaining installation file admission tracked in #4672.
Replace ambiguous absent observations with an owning Result producer for
Java prerequisite probes. Preserve missing-command, runtime-failure and
unresolved-property outcomes, process error codes, both bounded streams,
raw byte counts and partial properties through provider and doctor adapters.
Reject malformed numeric-prefix versions while retaining their source facts.
Migrate all injected hosts to the named probe contract and remove the old
parser/observation ownership from installation discovery.
Validation: 17 focused files, 350 passed; npm run check passed. Public doctor
fixtures distinguish absent/nonzero/malformed commands. Real installed JDK
and Ghidra readiness facts matched across 20 baseline/candidate CLI tasks.
Warm repeat raw replies6392tokens each, elapsed .448/.444s, CPU .662/.660s;
sampled family memory varied and reversed direction on repeat. No causal
performance improvement claim, true-cold or full-agent/fault-path measurement.
Synchronous probe deadline/cancellation/family cleanup remains #4561 and needs
coordinated discovery/admission supervision; no claim that it is fixed here.
No real failing JVM or Windows runtime verification performed.
Refs #4560, #4561
morluto