fix: Update start.sh to use correct Claude CLI auth detection

The previous credential check looked for ~/.claude/.credentials.json,
which no longer exists in recent versions of Claude CLI. This caused
the script to incorrectly prompt users to login even when they were
already authenticated.

Changes:
- Remove check for non-existent .credentials.json file
- Check for ~/.claude directory existence instead
- Always remind users about 'claude login' since we can't verify auth
  status without making an API call
- If ~/.claude doesn't exist, pause and warn (but allow continuing)
- Add explanatory comments about the limitation

The new approach is honest about what we can and can't verify:
- We CAN check if the CLI is installed (command -v claude)
- We CAN check if ~/.claude directory exists (CLI has been run)
- We CANNOT verify actual auth status without an API call

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

start.sh

@@ -20,40 +20,18 @@ fi
 
 echo "[OK] Claude CLI found"
 
-# Check if user has credentials
-CLAUDE_CREDS="$HOME/.claude/.credentials.json"
-if [ -f "$CLAUDE_CREDS" ]; then
-    echo "[OK] Claude credentials found"
+# Note: Claude CLI no longer stores credentials in ~/.claude/.credentials.json
+# We can't reliably check auth status without making an API call, so we just
+# verify the CLI is installed and remind the user to login if needed
+if [ -d "$HOME/.claude" ]; then
+    echo "[OK] Claude CLI directory found"
+    echo "     (If you're not logged in, run: claude login)"
 else
-    echo "[!] Not authenticated with Claude"
+    echo "[!] Claude CLI not configured"
     echo ""
-    echo "You need to run 'claude login' to authenticate."
-    echo "This will open a browser window to sign in."
+    echo "Please run 'claude login' to authenticate before continuing."
     echo ""
-    read -p "Would you like to run 'claude login' now? (y/n): " LOGIN_CHOICE
-
-    if [[ "$LOGIN_CHOICE" =~ ^[Yy]$ ]]; then
-        echo ""
-        echo "Running 'claude login'..."
-        echo "Complete the login in your browser, then return here."
-        echo ""
-        claude login
-
-        # Check if login succeeded
-        if [ -f "$CLAUDE_CREDS" ]; then
-            echo ""
-            echo "[OK] Login successful!"
-        else
-            echo ""
-            echo "[ERROR] Login failed or was cancelled."
-            echo "Please try again."
-            exit 1
-        fi
-    else
-        echo ""
-        echo "Please run 'claude login' manually, then try again."
-        exit 1
-    fi
+    read -p "Press Enter to continue anyway, or Ctrl+C to exit..."
 fi
 
 echo ""