Merge PR #8598: fix(session): repair torn JSONL appends (@roboomp)

# Conflicts:
#	packages/coding-agent/src/session/session-loader.ts
#	packages/coding-agent/src/session/session-manager.ts
#	packages/coding-agent/test/session-loader-stream.test.ts

packages/coding-agent/src/modes/interactive-mode.ts

@@ -50,6 +50,7 @@ import {
 	logger,
 	postmortem,
 	prompt,
+	sanitizeText,
 	setProjectDir,
 } from "@oh-my-pi/pi-utils";
 import chalk from "@oh-my-pi/pi-utils/chalk";
@@ -1112,6 +1113,15 @@ export class InteractiveMode implements InteractiveModeContext {
 		// before initHooksAndCustomTools/#reconcileModeFromSession/#enterPlanMode —
 		// all of which can reach setSessionName during init.
 		this.#eventBusUnsubscribers.push(
+			this.sessionManager.onPersistenceError(error => {
+				const detail = truncateToWidth(
+					replaceTabs(sanitizeText(error.message)).replace(/[\r\n]+/g, " "),
+					TRUNCATE_LENGTHS.LINE,
+				);
+				this.showWarning(
+					`Session persistence failed: ${detail}. Unsaved entries remain in memory; persistence will retry on the next entry.`,
+				);
+			}),
 			this.sessionManager.onSessionNameChanged(() => {
 				setSessionTerminalTitle(this.sessionManager.getSessionName(), this.sessionManager.getCwd());
 				this.#handleSessionAccentInputsChanged();