[Test Coverage] Add 100% test coverage for logs-audit command

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Summary

This PR adds comprehensive unit tests for src/commands/logs-audit.ts, bringing it from 0% to 100% statement coverage.

Coverage Improvement

File	Before	After
commands/logs-audit.ts	0%	100% statements, 95.65% branches
Overall	80.53%	83.86% (+3.33%)

What's Tested

The new test file src/commands/logs-audit.test.ts (18 tests) covers:

Error Paths

• Exit with error when no log entries found
• Exit with error when no policy manifest found

Output Formats

• JSON format: correct structure with domain, decision, matchedRule
• Markdown format: policy summary, rule evaluation table
• Pretty format: rule evaluation display
• Default fallback to pretty for unrecognized formats

Filtering

• Filter by rule ID (--rule)
• Filter by domain — case-insensitive substring match (--domain)
• Filter by decision=allowed or denied (--decision)
• Automatic exclusion of error:transaction-end-before-headers operational entries

Output Details

• Markdown denied requests section (capped at 50 rows with overflow count)
• Markdown policy flags: SSL Bump, DLP, Host Access status
• Pretty denied requests section (capped at 20 rows with overflow count)
• Source option passed correctly to discoverAndSelectSource
• shouldLog callback correctly suppresses logs for JSON format

Test Approach

All external dependencies are mocked (logs-command-helpers, log-aggregator, audit-enricher, logger), ensuring tests are fast and deterministic with no filesystem or network I/O.

Validation

• ✅ All 18 new tests pass
• ✅ All pre-existing 1167 tests continue to pass (3 pre-existing failures unrelated to this PR)
• ✅ Linter: 0 errors
• ✅ Coverage thresholds maintained

AI generated by Weekly Test Coverage Improver