fix: correctly evaluate clause and conditional expressions

[salama968]

Closes #117

This PR resolves issue #117 by fixing two critical bugs in TemplateMarkInterpreter.ts that prevented {{#clause condition}} statement from evaluating correctly.

changes

• Fixed Evaluation Precedence: Reordered the logic in clause definition handling so that explicit user conditions (context.condition) are evaluated before the implicit undefined field checks. This ensures the user's condition logic is no longer bypassed when optional fields are missing.

• Fixed Boolean Parsing: Replaced the flawed !!result truthiness check with JSON.parse(resultStr). Previously, a condition returning false was stringified as "false", which incorrectly evaluated to true. It now correctly parses to a boolean false.

Tests

Added 3 new Jest test cases (clause-condition-*) to explicitly verify:

• Clauses with conditions properly hide when optional fields are missing.

• Clauses with conditions properly render when optional fields are present.

• Clauses with explicit return false conditions do not render, even if the data field exists (verifying the boolean parsing fix).

related issues

• issue Bug: {{#clause condition}} logic is bypassed and incorrectly evaluates false as true #117

[Copilot]

Pull request overview

Fixes evaluation of condition="..." for {{#if}} and {{#clause}} constructs in the TemplateMark interpreter so that explicit conditions are evaluated correctly (including proper handling of "false" results), and adds regression fixtures.

Changes:

• Parse JSON-stringified condition results instead of using truthiness coercion for ConditionalDefinition and ClauseDefinition.
• Reorder clause handling to evaluate explicit context.condition before the implicit “undefined/null” clause-skip check.
• Add three new “good template” fixtures and update Jest snapshots to cover clause condition scenarios.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/TemplateMarkInterpreter.ts	Fixes clause/conditional condition evaluation precedence and boolean parsing.
src/runtime/declarations.ts	Updates generated base64-encoded runtime typings (Smart Legal Contract).
test/templates/good/clause-condition-optional/template.md	New fixture: clause condition with missing optional field.
test/templates/good/clause-condition-optional/model.cto	New fixture model for optional clause condition test.
test/templates/good/clause-condition-optional/data.json	New fixture data (optional field missing).
test/templates/good/clause-condition-optional-present/template.md	New fixture: clause condition with optional field present.
test/templates/good/clause-condition-optional-present/model.cto	New fixture model for optional-present test.
test/templates/good/clause-condition-optional-present/data.json	New fixture data (optional field present).
test/templates/good/clause-condition-false/template.md	New fixture: clause condition always false.
test/templates/good/clause-condition-false/model.cto	New fixture model for always-false test.
test/templates/good/clause-condition-false/data.json	New fixture data for always-false test.
test/snapshots/TemplateMarkInterpreter.test.ts.snap	Snapshot updates for new fixtures.

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