feat: replace Code conversation archive with deletion

electron/coding-runtime/pi/resource-loader.ts

@@ -1,4 +1,4 @@
-import { mkdir, rename, stat } from 'node:fs/promises';
+import { mkdir, readdir, rename, rm, stat } from 'node:fs/promises';
 import path from 'node:path';
 import { atomicWriteJson, atomicWriteText } from '../../coding-projects/atomic-json';
 import { validateSessionKey } from '../../coding-projects/conversation-store';
@@ -166,6 +166,33 @@ export async function archivePiConversationSession(input: {
   }
 }
 
+export async function deletePiConversationSession(input: {
+  userDataDir: string;
+  projectId: string;
+  sessionKey: string;
+}): Promise<void> {
+  const projectId = managedSegment(input.projectId, 'Project id');
+  const sessionKey = validateSessionKey(input.sessionKey);
+  const paths = getPiManagedPaths(input.userDataDir);
+  const basename = `${sessionKey}.jsonl`;
+  for (const root of [paths.sessionsDir, paths.trashDir]) {
+    const directory = path.join(root, projectId);
+    const entries = await readdir(directory, { withFileTypes: true }).catch((error: NodeJS.ErrnoException) => {
+      if (error.code === 'ENOENT') return [];
+      throw error;
+    });
+    for (const entry of entries) {
+      // Pi 0.84 stores sessions as <ISO timestamp>_<session id>.jsonl;
+      // earlier managed sessions used the session id alone.
+      const timestamp = entry.name.endsWith(`_${basename}`)
+        ? entry.name.slice(0, -(`_${basename}`.length))
+        : '';
+      if (entry.name !== basename && !/^\d{4}-\d{2}-\d{2}T\d{2}-\d{2}-\d{2}-\d{3}Z$/u.test(timestamp)) continue;
+      await rm(path.join(directory, entry.name), { force: true });
+    }
+  }
+}
+
 function normalizeSkillEntries(skillEntries: readonly PiSkillEntry[]): PiSkillEntry[] {
   const result: PiSkillEntry[] = [];
   const seen = new Set<string>();