Fix shell variable interpolation in Python heredoc

[Copilot]

The configure-claude-mcp.sh script was using unquoted heredoc with shell variables inside Python code, causing variables to be passed literally rather than interpolated correctly.

Changes

• Use quoted heredoc delimiter (<< 'PYEOF') to prevent premature shell expansion
• Pass shell variables as command-line arguments to Python script
• Read file paths from sys.argv instead of attempting variable interpolation

Before:

python3 << PYEOF
with open("$CLAUDE_CONFIG", 'r') as f:  # $CLAUDE_CONFIG passed literally
    base = json.load(f)
PYEOF

After:

python3 - "$CLAUDE_CONFIG" "$TEMP_CONFIG" << 'PYEOF'
base_config_file = sys.argv[1]  # Reads actual path value
overlay_config_file = sys.argv[2]
with open(base_config_file, 'r') as f:
    base = json.load(f)
PYEOF

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