The HYPOTHESES block was empty on most sessions because the only rules
covered backend failure patterns (5xx + rage). Add 7 behavioral patterns
derived from canonical custom events — these give the LLM analyzer
concrete starting points instead of reasoning from raw timeline alone.
Patterns (all conservative — fire only on clear evidence):
1. Catalog evaluated, no checkout (parts_panel_viewed>=3 + on upgrade
page + !checkout_started)
2. Fresh trial + successful decode (happy onboarding)
3. VIN decode failure pattern (failures>=2 or fallback>=1)
4. Rage click on subscription UI (upgrade friction)
5. Cancel flow entered without resume (churn risk)
6. Trial urgency banner ignored (banner_viewed without CTA)
7. Search opened but no decode attempted (funnel drop)
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