Add (param :as type) annotations to defcomp params across all services and templates

Annotates ~500 defcomp params across 62 files: market (5), blog (7), cart (5),
events (3), federation (4), account (3), orders (2), shared templates (11),
sx docs (14), plus remaining spec fn params (z3, test-framework, adapter-dom,
adapter-async, engine, eval). Total annotations in codebase: 1043.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sx/sx/not-found.sx

@@ -1,6 +1,6 @@
 ;; 404 Not Found page content
 
-(defcomp ~not-found-content (&key path)
+(defcomp ~not-found-content (&key (path :as string?))
   (div :class "max-w-3xl mx-auto px-4 py-12 text-center"
     (h1 :style (cssx (:text (colour "stone" 800) (size "3xl") (weight "bold")))
       "404")