Unit tests for Review stage

[SorraTheOrc]

Create comprehensive unit tests for Stage 3 Review in src/tui/tests/review.test.ts:

Test groups:

1. Pure helper tests:

   • intensityIndex: all 5 values + unknown
   • textureIndex: all 9 values + unknown
   • medianIntensity: odd count, even count, single entry, empty
   • medianTextureIndex: same variations
   • flagCoherenceOutliers: normal flagging, all same (no flags), <3 entries skip, boundary cases (exactly 1 step = no flag, exactly 2 steps = flag)
   • buildSummaryRows: with and without outliers, warning indicator presence

2. Interactive flow tests:

   • runReviewStage with confirm action returns 'advance'
   • runReviewStage with back action returns 'back'
   • runReviewStage swap flow (select recipe, mock audition, verify updated selection)
   • runReviewStage add flow returns 'back' to re-enter Define
   • runReviewStage remove flow (verify removal from session)
   • <3 entries shows info message, skips coherence
   • Empty palette after removal warns and prevents advance

Follow the mocking pattern from explore.test.ts: mock @inquirer/prompts, ../../output.js, ../../core/renderer.js, ../../audio/player.js.

Acceptance Criteria:

• All pure helpers have at least 2 test cases each
• All interactive flows have at least 1 test case each
• Coherence flagging has boundary tests
• Tests pass with npm test

[SorraTheOrc]

\n\n**worklog**\n\nClosed with reason: Producer review: 54 comprehensive unit tests in src/tui/__tests__/review.test.ts (751 lines). Coverage includes all pure helpers (intensityIndex, textureIndex, median variants, flagCoherenceOutliers, buildSummaryRows) and all interactive flows (confirm, back, add, remove, swap with cache, swap without cache, empty palette, coherence skip/warnings/success). All tests pass.