fix(kuna): own cancellable installation startup

Reuse the shared startup owner for independent caller waits, final departure cleanup, and session closure. Carry the producer signal through version probing and fingerprint finalization. Retry cleanly cancelled acquisition after settlement while retaining authored failures and exact descriptor cleanup dependencies.

Refs: #4698

docs/kuna-provider.md

@@ -87,6 +87,10 @@ caller requested. `diagnostics.producer_operation` retains the internal producer
 name when it differs. Caller-specific failures keep the producer's typed outcome,
 captured output, partial facts and live cleanup dependencies; cleanup retry
 updates every projection rather than preserving an independent stale marker.
+Installation acquisition is shared, with independently cancellable caller waits.
+The final departing caller stops the probe and joins its cleanup; session close
+also stops and joins acquisition. A cleanly cancelled acquisition can be retried,
+while a retained cleanup failure blocks replacement until its owner is closed.
 
 ## Provenance and limitations