fix(coding-agent): fixed bash output integrity, job lifecycle, and interception

artifact spill now includes the head-retained bytes (full capture was missing first ~20KB); chunk throttle coalesces instead of dropping; cd-prefix extraction defers shell-expanded paths; interceptor rule is quote-aware and catches clobber and variable targets; completed async jobs release their Shell; at job cap commands degrade to foreground; PTY mode drops the non-interactive env and notes silent downgrades; timeout/abort annotations always appended; removed dead idle-timeout-watchdog.

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

@@ -314,7 +314,9 @@ export async function executeBash(command: string, options?: BashExecutorOptions
 		if (userSignal) {
 			userSignal.removeEventListener("abort", abortHandler);
 		}
-		if (resetSession) {
+		if (resetSession || options?.sessionKey?.includes(":async:")) {
+			// `:async:` keys are per-job (jobId is unique), so the Shell would
+			// otherwise stay in the process-global map forever after completion.
 			shellSessions.delete(sessionKey);
 		}
 	}