giles 0c8c0b6426 Cache-bust .sx files, optimize stepper back/hydration ...

Platform:
- sx-platform.js: extract ?v= query from script tag URL, append to
  all .sx file XHR requests. Prevents stale cached .sx files.

Stepper performance:
- do-back: use rebuild-preview (pure SX→DOM render) instead of
  replaying every do-step from 0. O(1) instead of O(n).
- Hydration effect: same rebuild-preview instead of step replay.
- Cookie save moved from do-step to button on-click handlers only.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-25 14:54:43 +00:00

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