Fix misleading auto-detection comments in AbstractToolEnvCommand

[Copilot]

Comments in AbstractToolEnvCommand.shouldIncludeCmdVar() and shouldIncludeHomeVar() incorrectly suggested conditional logic based on custom variable names, but the implementation unconditionally returns true in auto mode.

Changes

• Clarified misleading comments: Updated comments to accurately reflect that auto mode always includes environment variables by default, removing the incorrect suggestion of conditional behavior

// Before (misleading):
// Auto: include if custom name provided, otherwise include by default
return true;

// After (accurate):
// Auto: include by default
return true;

The logic itself is correct—auto mode should include variables by default. Only the comments were inaccurate.

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