feat(design-review): add Phase 7 - Thinking Fast and Slow - Cognitive Load (S1/S2) audit

[MaruPelkar]

Summary

• Adds Phase 7: Cognitive Load (S1/S2) to /design-review, inserted between Phase 6 (Compile Report) and the existing Triage phase
• Every audited screen gets rated on a System 1 ↔ System 2 scale (0-10), grounded in browse data already collected (snapshot -i, links, perf)
• Screens scoring above 3 that aren't intentional friction get flagged with specific UX law violations (Fitts, Hick, Jakob, Miller, Peak-End, Von Restorff, Zeigarnik, Gestalt, Motivation) and the measurement that proves it
• Results displayed as ASCII slider, included in the Phase 11 report
• Renumbers existing phases 7-11 → 8-12 and updates all cross-references (sub-steps, Additional Rules)

Example output

Landing         S1 |--●-------| S2  [2/10]  ✓
Onboarding      S1 |-●--------| S2  [1/10]  ✓
Dashboard       S1 |-------●--| S2  [7/10]  ✗ Hick (31 items, no filter), Miller (93 data points), Gestalt (no grouping)
Settings        S1 |----●-----| S2  [4/10]  ✗ Hick (23 toggles on one page)
Delete Account  S1 |--------●-| S2  [8/10]  ✓ (intentional friction)

Test plan

• Run /design-review on a live site and verify Phase 7 produces the S1/S2 slider
• Confirm subsequent phases (8-12) execute correctly with renumbered references
• Verify the cognitive load section appears in the Phase 11 report output

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