test: add unit tests for gate-evaluator module

[nikolasdehor]

Summary

Closes #237

Add 57 unit tests for the GateEvaluator class in .aios-core/core/orchestration/gate-evaluator.js (494 lines, previously 0% coverage).

Test Coverage

Area	Tests	Key Scenarios
Exports & Constructor	5	Verdict enum, defaults, strictMode
Config Loading	4	Custom, YAML merge, fallback, error
Epic 3 Checks	7	spec_exists, complexity, requirements, minScore
Epic 4 Checks	7	plan_complete, implementation, errors, requireTests
Epic 6 Checks	4	qa_report, verdict, tests_pass
Unknown/Default Checks	3	Unknown passthrough, defaults per epic
minTestCoverage	4	Pass, fail, default 0, skip when 0
Verdict Determination	8	Strict mode, severity levels, blocking, allowMinorIssues, error catch
Score Calculation	4	Perfect, partial, zero, empty
Helpers	2	shouldBlock, needsRevision
Results Storage	5	getResults, getResult, getSummary, copy semantics
Clear & Logging	3	Reset, log structure, copy
Result Structure	1	Field validation

Testing Approach

• Mocks fs-extra and js-yaml for isolation
• Tests all check types: spec_exists, complexity_assessed, requirements_defined, plan_complete, implementation_exists, no_critical_errors, qa_report_exists, verdict_generated, tests_pass
• Validates verdict flow: APPROVED → NEEDS_REVISION → BLOCKED escalation
• Covers edge cases: empty checks, non-iterable config errors, skipped tests

All 57 tests passing.

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Pull request overview

Adds comprehensive Jest unit tests for the GateEvaluator quality-gating logic to improve coverage and prevent regressions in epic-to-epic gate evaluation.

Changes:

• Introduces a new test suite covering config loading, check execution, verdict escalation, scoring, results/log storage, and error handling for GateEvaluator.
• Mocks fs-extra and js-yaml to isolate gate-config loading behavior and avoid filesystem dependencies.

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[nikolasdehor]

Consolidated into #426