Abort session work during dispose

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

@@ -708,6 +708,16 @@ export class AgentSession {
 	 * Call this when completely done with the session.
 	 */
 	dispose(): void {
+		try {
+			this.abortRetry();
+			this.abortCompaction();
+			this.abortBranchSummary();
+			this.abortBash();
+			this.agent.abort();
+		} catch {
+			// Dispose must succeed even if an abort hook throws.
+		}
+
 		this._extensionRunner.invalidate(
 			"This extension ctx is stale after session replacement or reload. Do not use a captured pi or command ctx after ctx.newSession(), ctx.fork(), ctx.switchSession(), or ctx.reload(). For newSession, fork, and switchSession, move post-replacement work into withSession and use the ctx passed to withSession. For reload, do not use the old ctx after await ctx.reload().",
 		);