Claude Code: Fix A2A communication - ensure CAIN_STATUS_PATH is always set

- Remove conditional check that prevented CAIN_STATUS_PATH from being set
- Always set CAIN_STATUS_PATH when OPENCLAW_DATA_DIR is available
- This ensures health_monitor.py can always find the status file
- Fixes path resolution mismatch between app.py and health_monitor.py

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app.py

@@ -14,10 +14,15 @@ print(">>> CAIN: Python version:", sys.version.split()[0], flush=True)
 print(">>> CAIN: Working directory:", os.getcwd(), flush=True)
 print(">>> CAIN: PORT =", os.environ.get('PORT', '7860'), flush=True)
 
-# Set CAIN_STATUS_PATH from OPENCLAW_DATA_DIR if available (for error_handlers.py)
-if 'CAIN_STATUS_PATH' not in os.environ and 'OPENCLAW_DATA_DIR' in os.environ:
+# Set CAIN_STATUS_PATH from OPENCLAW_DATA_DIR if available (for error_handlers.py and health_monitor.py)
+# IMPORTANT: Always set this env var so health_monitor.py can find the status file
+if 'OPENCLAW_DATA_DIR' in os.environ:
     os.environ['CAIN_STATUS_PATH'] = os.path.join(os.environ['OPENCLAW_DATA_DIR'], 'cain_status.json')
     print(f">>> CAIN: Set CAIN_STATUS_PATH = {os.environ['CAIN_STATUS_PATH']}", flush=True)
+elif 'CAIN_STATUS_PATH' not in os.environ:
+    # Fallback if OPENCLAW_DATA_DIR is not set
+    os.environ['CAIN_STATUS_PATH'] = '/data/cain_status.json'
+    print(f">>> CAIN: Set CAIN_STATUS_PATH (fallback) = {os.environ['CAIN_STATUS_PATH']}", flush=True)
 
 # CRITICAL: Create FastAPI app at TOP LEVEL, outside any try/except
 # This ensures the server ALWAYS starts, even if brain is broken