Address ds-review-bot v5/v6 review round 4:
- renderType now holds the no-throw contract across the whole walk, not
just root validation: a stateful getter that passes validation and then
throws in the render phase degrades the node to Any, rolling back any
classes the call had begun emitting, instead of escaping.
- allocateClassName caps the accumulated base name. Child class names
derive from their parent's, so an unbounded single-field object chain
grew the sum of names to Theta(depth^2) (a 5000-deep schema produced a
~25MB SDK); the cap keeps total emitted text linear, the collision
counter still makes truncated bases unique.
- The language-dispatch note's Consequences first sentence and the zh
guard paragraph are corrected: two table entries (not one), and
full-width Chinese punctuation per translation-rules.md.