Zareian 7683920b0b docs: handbook, diagrams and guides brought up to 2026-10-02 ...

- technical-handbook: question packs instead of subscriptions, real
  hearts with the new wait screen (screenshot), math-only tutor and what
  is charged (new 9-7), admin cancel/refund, Bazaar planId, account
  deletion, 59 endpoints, 779 tests, 14 apps, status and open decisions.
- Diagrams redrawn: use-case (buy a pack, refunds), data model
  (QuestionCredit, HeartsPass, Profile.birth_date), pack payment sequence.
- The PDF is now built from the Markdown by docs/build_handbook.py
  (pandoc + Chrome, font in docs/assets); the hand-made HTML it used to
  come from was not in the repo and had been lost.
- architecture, operations, security-before-production (item 13 closed),
  ai-cost-and-guardrails and README follow the same changes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-02 23:10:50 +03:30

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