Update API documentation to match actual implementation

Background

As identified in PR #110 review, the ComparisonOperator enum values listed in the API documentation do not match the actual implementation.

Problem

• Documentation shows enum values like EQ, NE
• Actual implementation uses EQUALS, NOT_EQUALS, etc.
• This inconsistency can confuse API users

Solution

Update the documentation in docs/reference/api/aspect-api-reference.md to match the actual enum values in contexts/scope-management/application/src/main/kotlin/io/github/kamiazya/scopes/scopemanagement/application/query/AspectQueryAST.kt.

Files Affected

• docs/reference/api/aspect-api-reference.md

Priority

Low - Documentation fix