fix(coding-agent): harden archived stats cleanup

packages/coding-agent/src/export/html/index.ts

@@ -181,10 +181,17 @@ export interface SessionData {
 	subSessions?: Record<string, SubSession>;
 }
 
+function sessionHeaderForExport(header: SessionHeader | null): SessionHeader | null {
+	if (!header) return null;
+	const exported = { ...header };
+	delete exported.previousSessionFiles;
+	return exported;
+}
+
 /** Snapshot the session (plus optional agent state) into the JSON shape the viewer renders. */
 export function buildSessionData(sm: SessionManager, state?: AgentState): SessionData {
 	return {
-		header: sm.getHeader(),
+		header: sessionHeaderForExport(sm.getHeader()),
 		entries: sm.getEntries(),
 		leafId: sm.getLeafId(),
 		systemPrompt: state?.systemPrompt.join("\n\n"),
@@ -231,7 +238,7 @@ async function collectSubSessionsFromDir(
 			out[key] = {
 				agentId,
 				parent: parentKey,
-				header,
+				header: sessionHeaderForExport(header),
 				entries,
 				leafId: entries.length > 0 ? entries[entries.length - 1].id : null,
 			};
@@ -295,7 +302,7 @@ export async function exportFromFile(inputPath: string, options?: ExportOptions
 	}
 
 	const sessionData: SessionData = {
-		header: sm.getHeader(),
+		header: sessionHeaderForExport(sm.getHeader()),
 		entries: sm.getEntries(),
 		leafId: sm.getLeafId(),
 	};

packages/coding-agent/src/export/share.ts

@@ -223,6 +223,7 @@ function collectShareRegexSecretValues(o: SecretObfuscator, data: SessionData):
 		if (!header) return;
 		add(header.title);
 		add(header.cwd);
+		for (const previousSessionFile of header.previousSessionFiles ?? []) add(previousSessionFile);
 	};
 
 	addHeader(data.header);
@@ -246,6 +247,9 @@ function redactShareHeader(
 		...header,
 		title: header.title === undefined ? undefined : o.obfuscate(header.title, sharedRegexSecretValues),
 		cwd: o.obfuscate(header.cwd, sharedRegexSecretValues),
+		previousSessionFiles: header.previousSessionFiles?.map(previousSessionFile =>
+			o.obfuscate(previousSessionFile, sharedRegexSecretValues),
+		),
 	};
 }