fix(pi-plugin): retrospective provider uses correct pi-coding-agent API (#201)

loadDefaultPiSessionDeps() looked for SessionManager.listSessions and a
public loadEntriesFromFile export, neither of which pi-coding-agent provides:
the class exports the static listAll() (verified in session-manager.ts), and
loadEntriesFromFile is internal (not re-exported from the package index).
So the retrospective dream task threw "Pi session APIs unavailable" and
silently reported "Skipped (no work)".

Use SessionManager.listAll, and derive entry loading from the public
parseSessionEntries + readFileSync when loadEntriesFromFile is absent (kept as
an optional path so a future public export still works).

Extracted from @kachook's PR #201 (the two real-code changes only; the PR
branch predated the v0.30.2 WebSocket migration and carried a stale revert +
version churn). Co-authored-by: kachook <kachook@users.noreply.github.com>

Author: ualtinok

packages/pi-plugin/src/dreamer/retrospective-raw-provider-pi.ts

@@ -1,3 +1,4 @@
+import { readFileSync } from "node:fs";
 import { resolve } from "node:path";
 
 import type {
@@ -191,20 +192,27 @@ async function loadDefaultPiSessionDeps(): Promise<
 > {
 	const mod = (await import(/* @vite-ignore */ PI_CODING_AGENT_MODULE)) as {
 		SessionManager?: {
-			listSessions?: (sessionDir?: string) => unknown[] | Promise<unknown[]>;
+			listAll?: (sessionDir?: string) => unknown[] | Promise<unknown[]>;
 		};
 		loadEntriesFromFile?: (filePath: string) => unknown[] | Promise<unknown[]>;
+		parseSessionEntries?: (content: string) => unknown[];
 	};
-	const listSessions = mod.SessionManager?.listSessions;
-	const loadEntriesFromFile = mod.loadEntriesFromFile;
-	if (
-		typeof listSessions !== "function" ||
-		typeof loadEntriesFromFile !== "function"
-	) {
+	const listSessions = mod.SessionManager?.listAll;
+	if (typeof listSessions !== "function") {
 		throw new Error(
-			"Pi session APIs unavailable: expected SessionManager.listSessions and loadEntriesFromFile",
+			"Pi session APIs unavailable: expected SessionManager.listAll on pi-coding-agent",
 		);
 	}
+	// loadEntriesFromFile is NOT part of pi-coding-agent's public API —
+	// fall back to readFileSync + parseSessionEntries (both exported).
+	const loadEntriesFromFile: (
+		filePath: string,
+	) => unknown[] | Promise<unknown[]> =
+		mod.loadEntriesFromFile ??
+		((filePath: string) => {
+			const content = readFileSync(filePath, "utf8");
+			return mod.parseSessionEntries?.(content) ?? [];
+		});
 	return {
 		listSessions: listSessions.bind(mod.SessionManager),
 		loadEntriesFromFile,