c84a6402590e387ec1c59a7bf937407cf2d5bf69
getting-help gains a "Hints" section — F1 for a tier-3 teaching hint on the live input, `hint` to explain the most recent error — with the real rendered block and a cast showing both: the live-input hint (via the demo-mode Ctrl-G→[F1] alias, since autocast can't send F1) and `hint` on an error. the-assistive-editor points at F1. Page converted to .mdx to embed the cast; CtrlG added to the cast generator's key map.
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