checkpoint: fix regression when using gemini cli outside of manual slop.

gemini_cli_adapter.py

@@ -2,6 +2,7 @@ import subprocess
 import json
 import sys
 import time
+import os
 
 class GeminiCliAdapter:
     def __init__(self, binary_path="gemini"):
@@ -24,13 +25,17 @@ class GeminiCliAdapter:
 
         accumulated_text = ""
         
+        env = os.environ.copy()
+        env["GEMINI_CLI_HOOK_CONTEXT"] = "manual_slop"
+
         process = subprocess.Popen(
             command,
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
             text=True,
-            shell=True
+            shell=True,
+            env=env
         )
 
         try: