feat: empty-container spawn (scratch workspace, no repo volume); fix bridge session isolation — explicit SessionManager per spawn stops SDK resuming the repo's old session (which also overrode LVMH_MODEL)

docker/bridge/index.mjs

@@ -7,6 +7,7 @@ import { existsSync } from "node:fs";
 import {
 	createAgentSession,
 	ModelRuntime,
+	SessionManager,
 } from "/usr/local/lib/node_modules/@earendil-works/pi-coding-agent/dist/index.js";
 
 const SETUP_PATH = "/workspace/.lvmh/setup.sh";
@@ -85,8 +86,15 @@ try {
 			console.error(`[lvmh-bridge] model resolution failed:`, err);
 		}
 	}
+	// Fresh session per spawn: without an explicit sessionManager the SDK
+	// picks up an existing session file for the cwd — sharing one transcript
+	// (and its saved model) across every spawn of the repo. A dedicated dir
+	// per daemon session id keeps spawns isolated and LVMH_MODEL authoritative.
+	const sessionRoot = process.env.PI_SESSION_DIR ?? "/pi-sessions";
+	const sessionDir = `${sessionRoot}/${process.env.LVMH_SESSION_ID ?? "default"}`;
+	const sessionManager = SessionManager.create(process.cwd(), sessionDir);
 	const { session } = await createAgentSession(
-		model === undefined ? {} : { model },
+		model === undefined ? { sessionManager } : { model, sessionManager },
 	);
 	// SDK does not bind extensions implicitly (unlike TUI/RPC modes); without
 	// bindExtensions the session_start event never fires, so the lvmh plugin