New SX primitives for child-to-parent communication in the render tree:
- spread type: make-spread, spread?, spread-attrs — child injects attrs
onto parent element (class joins with space, style with semicolon)
- collect!/collected/clear-collected! — render-time accumulation with
dedup into named buckets
~cssx/tw is now a proper defcomp returning a spread value instead of a
macro wrapping children. ~cssx/flush reads collected "cssx" rules and
emits a single <style data-cssx> tag.
All four render adapters (html, async, dom, aser) handle spread values.
Both bootstraps (Python + JS) regenerated. Also fixes length→len in
cssx.sx (length was never a registered primitive).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
giles
41097eeef9