Fix shell variable interpolation in Python heredoc

[Copilot]

Shell variables $CLAUDE_CONFIG and $TEMP_CONFIG were being interpolated incorrectly inside the Python heredoc in configure-claude-mcp.sh, causing the literal strings to be passed instead of their values.

Changes:

• Pass shell variables as command-line arguments to Python: python3 - "$CLAUDE_CONFIG" "$TEMP_CONFIG"
• Quote heredoc delimiter ('PYEOF') to prevent shell expansion
• Read file paths from sys.argv with validation in Python script

Before:

merge_json_with_python() {
    python3 << PYEOF
# ...
with open("$CLAUDE_CONFIG", 'r') as f:  # Literal string, not interpolated

After:

merge_json_with_python() {
    python3 - "$CLAUDE_CONFIG" "$TEMP_CONFIG" << 'PYEOF'
# ...
base_config_file = sys.argv[1]
with open(base_config_file, 'r') as f:  # Proper argument handling

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