fix(coding-agent): align computer session ownership

packages/coding-agent/src/session/agent-session.ts

@@ -3516,7 +3516,7 @@ export class AgentSession {
 			this.#disposeOwnedAsyncJobs(),
 			this.#eval.disposeKernels(),
 			this.#releaseOwnedBrowserTabs(this.sessionManager.getSessionId()),
-			this.#releaseOwnedComputerSessions(this.#evalKernelOwnerId),
+			this.#releaseOwnedComputerSessions(this.#eval.getKernelOwnerId()),
 			shutdownTinyTitleClient(),
 			this.#disconnectOwnedMcp(),
 			advisorRecorderClosed,
@@ -4135,6 +4135,9 @@ export class AgentSession {
 	getEvalSessionId(): string | null {
 		return this.#eval.getSessionId();
 	}
+	getEvalKernelOwnerId(): string {
+		return this.#eval.getKernelOwnerId();
+	}
 
 	/** Current session display name, if set */
 	get sessionName(): string | undefined {

packages/coding-agent/src/session/eval-runner.ts

@@ -145,6 +145,11 @@ export class EvalRunner {
 		return this.#pendingMessages.length > 0;
 	}
 
+	/** Returns the stable owner shared by eval and session-owned tools. */
+	getKernelOwnerId(): string {
+		return this.#kernelOwnerId;
+	}
+
 	/** Returns the eval session shared with the Python backend. */
 	getSessionId(): string | null {
 		if (this.#parentSessionId !== undefined) return this.#parentSessionId;