After REA stopped a Rizin debug session (frame or output limit, deadline,
cancellation, protocol failure) or the debugger exited, later commands
returned a generic invalid_request and status gave no reason. GDB
collapsed the same states the same way.
Both managers now keep a published session addressable until
close_*_session releases it, record the first reason it stopped, report
it as closed_reason in session status, and refuse later commands with
capability_unavailable naming that reason and the close-then-restart
recovery. An ID the server never returned, or that close released, still
fails as invalid_request with its own recovery. Retained stopped
sessions keep their slot, which the capacity recovery now says. A GDB
command deadline now records its reason like cancellation already did.
Fixes#8024
Co-Authored-By: gensokyo-dev <gensokyo-dev@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
