fix(template): guard optional property in nested test

[OmarElzero]

This pull request resolves a test failure in test/TemplateMarkInterpreter.test.ts that occurred after the stricter optional property checks were introduced in PR #53.

The should generate optional-nested test was failing with the error Optional properties used without guards: age. This was because the template was using an optional property (age) without a guard.

This fix wraps the age variable in the test/templates/good/optional-nested/template.md file with an {{#optional}} block, ensuring it conforms to the new validation rules. The corresponding test snapshot has also been updated.

Fixes #112

[Copilot]

Pull request overview

Updates the optional-nested “good” template to satisfy the stricter optional-property type checking introduced in PR #53 by guarding access to the optional age field, and refreshes the interpreter snapshot accordingly.

Changes:

• Wrap age usage in test/templates/good/optional-nested/template.md with an {{#optional}} guard.
• Update the Jest snapshot to reflect the generated Optional node output.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
test/templates/good/optional-nested/template.md	Adds an {{#optional age}} guard around the age interpolation in the template.
test/__snapshots__/TemplateMarkInterpreter.test.ts.snap	Updates expected generated AgreementMark/CiceroMark JSON (including Optional node structure and list tightness).

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[Copilot]

The blank line between list items (after the age bullet) changes the CommonMark list from tight to loose (snapshot tight flips to false). Since this PR’s goal is only to add an optional guard, consider removing the blank line to preserve the original list structure/output and avoid an unrelated snapshot change.

Suggested change

[Copilot]

Wrapping only {{age}} means that when age is absent the template will still emit the bullet - You are ** years old (empty emphasis/content). To make the optional handling render cleanly, wrap the whole list item in the {{#optional age}}...{{/optional}} block or provide an {{else}} branch with fallback text.

Suggested change

	- You are *{{#optional age}}{{this}}{{/optional}}* years old
	{{#optional age}}- You are *{{this}}* years old{{/optional}}