fix(process): cancel run-token reads during sampling

Propagate the sample AbortSignal through readProcessRunId to host environment inspection so cancellation can settle a blocked ownership-token read.

Validation: ownership and capture lifecycle suites pass, including an abort-waiting host regression. Native provider runtime behavior was not exercised.

src/process/capture/ProcessSampling.ts

@@ -358,7 +358,7 @@ const inspectInitializedPtyRoot = async (
     return undefined;
   let observedRunId: string | undefined;
   try {
-    observedRunId = await readProcessRunId(rootPid);
+    observedRunId = await readProcessRunId(rootPid, undefined, signal);
   } catch (cause: unknown) {
     // Unreadable run identity means the root cannot be attributed.
     void cause;