fix(bash): kept persistent shells after cancel

Stopped marking persistent bash sessions as permanently broken when the JavaScript abort or timeout race wins.

Stopped the Rust descendant kill-wave helper once no cancellation targets remain so later commands are not swept into old cancels.

Fixes #1347

packages/coding-agent/src/exec/bash-executor.ts

@@ -207,9 +207,6 @@ export async function executeBash(command: string, options?: BashExecutorOptions
 			void runPromise.catch(() => undefined);
 			if (shellSession) {
 				resetSession = true;
-				// Fall back to one-shot execution for the rest of the process once
-				// a persistent session has stopped responding to cancellation.
-				brokenShellSessions.add(sessionKey);
 			}
 			return {
 				exitCode: undefined,