Fix shell variable interpolation in Python heredoc

[Copilot]

The Python heredoc in configure-claude-mcp.sh was attempting to use shell variable interpolation ($CLAUDE_CONFIG, $TEMP_CONFIG), which doesn't work as the strings are passed literally to Python.

Changes

• Pass file paths as command-line arguments to Python: python3 - "$CLAUDE_CONFIG" "$TEMP_CONFIG"
• Use single-quoted heredoc marker << 'PYEOF' to prevent shell expansion
• Modified Python script to read paths from sys.argv[1] and sys.argv[2]
• Improved variable names (base_config_file, overlay_config_file) and error messages for clarity

# Before: Shell variables interpolated incorrectly
python3 << PYEOF
with open("$CLAUDE_CONFIG", 'r') as f:  # Literal string "$CLAUDE_CONFIG"
    ...

# After: Arguments passed correctly
python3 - "$CLAUDE_CONFIG" "$TEMP_CONFIG" << 'PYEOF'
base_config_file = sys.argv[1]
with open(base_config_file, 'r') as f:
    ...

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