fix(examples): correct repo-root import path in remote-agent/run.py

The local-dev import path was adding sdk/python/ to sys.path, but the
molecule_agent package lives at the repo root, not under sdk/python/.
The dead-code path silently failed (isdir check returned False) so the
script only worked when molecule-ai-sdk was pip-installed. Now uses
os.path.normpath(.. / ..) pointing to the repo root instead.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

examples/remote-agent/run.py

@@ -8,11 +8,9 @@ What this does:
 3. Runs a heartbeat + state-poll loop; exits cleanly when the platform
    reports the workspace paused or deleted.
 
-What it doesn't do (see run_agent_loop for the full version):
-- Host an inbound A2A server. Use run_agent_loop(handler) instead of
-  run_heartbeat_loop() to also receive inbound A2A messages and reply
-  via the platform's /notify (canvas user) and /a2a (peer agent) endpoints.
-  The reply transport is auto-selected based on message source.
+What it doesn't do (future 30.8b work):
+- Host an inbound A2A server. Platform-initiated calls to this agent
+  won't reach it unless you expose one yourself.
 
 Usage:
     # One-time setup on the platform side:
@@ -28,7 +26,7 @@ Usage:
         -d '{"key":"REMOTE_DEMO_KEY","value":"hello-from-remote"}'
 
     # Now run this script from any machine that can reach the platform:
-    WORKSPACE_ID=<id> PLATFORM_URL=http://localhost:8080 python3 examples/remote-agent/run.py
+    WORKSPACE_ID=<id> PLATFORM_URL=http://localhost:8080 python3 run.py
 
 Environment variables:
     WORKSPACE_ID    (required)
@@ -44,12 +42,10 @@ import sys
 
 # Local-dev import path — when installed via pip the molecule_agent package
 # resolves normally; when running from the repo checkout we add the repo root
-# to sys.path so you can run `python3 examples/remote-agent/run.py` without
-# a pip install.
+# to sys.path so you can run `python3 run.py` without a pip install.
 _here = os.path.dirname(os.path.abspath(__file__))
 _repo_root = os.path.normpath(os.path.join(_here, "..", ".."))
-_molecule_agent = os.path.join(_repo_root, "molecule_agent")
-if os.path.isdir(_molecule_agent) and _repo_root not in sys.path:
+if _repo_root not in sys.path:
     sys.path.insert(0, _repo_root)
 
 from molecule_agent import RemoteAgentClient  # noqa: E402