feat(mtp): Expose spec tags as filterable IDE traits

[juvistr]

Summary

Expose spec tags as MTP trait properties for IDE filtering.

Motivation

• IDE filtering: Filter by tag in Test Explorer
• Leverages existing tags: `tag()` already exists in DSL
• Better organization: Group specs by category

Acceptance Criteria

• Tags exposed via `TestNodeTraitProperty`
• Rider/VS can filter by trait
• Multiple tags supported per spec
• Inherited tags from parent contexts
• Tests added
• Documentation updated

Example

describe("UserService", () => {
    tags("unit", "fast");
    
    describe("CreateAsync", () => {
        tag("integration");  // Has: unit, fast, integration
        
        it("creates user", () => { });
    });
});

In IDE Test Explorer: Filter by "integration" shows only tagged specs.

[github-actions]

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