feat: organize project conversations and add coding teacher side chat

electron/coding-projects/conversation-history.ts

@@ -0,0 +1,52 @@
+import { readFile } from 'node:fs/promises';
+import path from 'node:path';
+import type { CodingConversationV2 } from './conversation-store';
+import { validateSessionKey } from './conversation-store';
+import type { ConversationSnapshot } from '../../shared/coding-conversation-contracts';
+import { getPiManagedPaths } from '../coding-runtime/pi/resource-loader';
+import { projectPiSessionSnapshot } from '../coding-runtime/pi/session-projector';
+
+/** Read durable active-branch history without starting or reconfiguring Pi. */
+export async function readCodingConversationHistory(
+  userDataDir: string,
+  projectId: string,
+  conversation: CodingConversationV2
+): Promise<ConversationSnapshot> {
+  const base: ConversationSnapshot = {
+    schemaVersion: 1,
+    conversation: {
+      id: conversation.id,
+      projectId,
+      agentId: conversation.agentId,
+      title: conversation.title,
+      model: { model: conversation.model, modelResolution: conversation.modelResolution },
+    },
+    nodes: [],
+    run: { status: 'idle' },
+    queue: { items: [] },
+    context: { usedTokens: 0, contextWindow: 0, compaction: 'idle' },
+    pendingInteractions: [],
+    worker: { status: 'stopped', generation: 0 },
+    cursor: { workerGeneration: 0, seq: 0 },
+  };
+  if (!conversation.sessionKey) return base;
+  const filename = path.join(
+    getPiManagedPaths(userDataDir).sessionsDir,
+    projectId,
+    validateSessionKey(conversation.sessionKey) + '.jsonl'
+  );
+  const text = await readFile(filename, 'utf8');
+  // Pi 0.84.2 rebuilds its current leaf from the last non-header entry.
+  const entries = text
+    .split('\n')
+    .filter((line) => line.trim())
+    .map((line) => JSON.parse(line) as { id: string; type: string })
+    .filter((entry) => entry.type !== 'session');
+  const snapshot = await projectPiSessionSnapshot({
+    snapshot: base,
+    workerGeneration: 1,
+    state: { isStreaming: false },
+    entries: { entries, leafId: entries.at(-1)?.id ?? null },
+  });
+  return { ...snapshot, worker: { status: 'stopped', generation: 1 } };
+}