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
c75cf827e7