Add :effects annotations to all spec files and update bootstrappers

Bootstrappers (bootstrap_py.py, js.sx) now skip :effects keyword in
define forms, enabling effect annotations throughout the spec without
changing generated output.

Annotated 180+ functions across 14 spec files:
- signals.sx: signal/deref [] pure, reset!/swap!/effect/batch [mutation]
- engine.sx: parse-* [] pure, morph-*/swap-* [mutation io]
- orchestration.sx: all [mutation io] (browser event binding)
- adapter-html.sx: render-* [render]
- adapter-dom.sx: render-* [render], reactive-* [render mutation]
- adapter-sx.sx: aser-* [render]
- adapter-async.sx: async-render-*/async-aser-* [render io]
- parser.sx: all [] pure
- render.sx: predicates [] pure, process-bindings [mutation]
- boot.sx: all [mutation io] (browser init)
- deps.sx: scan-*/transitive-* [] pure, compute-all-* [mutation]
- router.sx: all [] pure (URL matching)

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

shared/sx/ref/boot.sx

@@ -26,7 +26,7 @@
 (define HEAD_HOIST_SELECTOR
   "meta, title, link[rel='canonical'], script[type='application/ld+json']")
 
-(define hoist-head-elements-full
+(define hoist-head-elements-full :effects [mutation io]
   (fn (root)
     (let ((els (dom-query-all root HEAD_HOIST_SELECTOR)))
       (for-each
@@ -71,7 +71,7 @@
 ;; Mount — render SX source into a DOM element
 ;; --------------------------------------------------------------------------
 
-(define sx-mount
+(define sx-mount :effects [mutation io]
   (fn (target (source :as string) (extra-env :as dict))
     ;; Render SX source string into target element.
     ;; target: Element or CSS selector string
@@ -100,7 +100,7 @@
 ;; Finds the suspense wrapper by data-suspense attribute, renders the
 ;; new SX content, and replaces the wrapper's children.
 
-(define resolve-suspense
+(define resolve-suspense :effects [mutation io]
   (fn ((id :as string) (sx :as string))
     ;; Process any new <script type="text/sx"> tags that arrived via
     ;; streaming (e.g. extra component defs) before resolving.
@@ -127,7 +127,7 @@
 ;; Hydrate — render all [data-sx] elements
 ;; --------------------------------------------------------------------------
 
-(define sx-hydrate-elements
+(define sx-hydrate-elements :effects [mutation io]
   (fn (root)
     ;; Find all [data-sx] elements within root and render them.
     (let ((els (dom-query-all (or root (dom-body)) "[data-sx]")))
@@ -143,7 +143,7 @@
 ;; Update — re-render a [data-sx] element with new env data
 ;; --------------------------------------------------------------------------
 
-(define sx-update-element
+(define sx-update-element :effects [mutation io]
   (fn (el new-env)
     ;; Re-render a [data-sx] element.
     ;; Reads source from data-sx attr, base env from data-sx-env attr.
@@ -165,7 +165,7 @@
 ;; Render component — build synthetic call from kwargs dict
 ;; --------------------------------------------------------------------------
 
-(define sx-render-component
+(define sx-render-component :effects [mutation io]
   (fn ((name :as string) (kwargs :as dict) (extra-env :as dict))
     ;; Render a named component with keyword args.
     ;; name: component name (with or without ~ prefix)
@@ -190,7 +190,7 @@
 ;; Script processing — <script type="text/sx">
 ;; --------------------------------------------------------------------------
 
-(define process-sx-scripts
+(define process-sx-scripts :effects [mutation io]
   (fn (root)
     ;; Process all <script type="text/sx"> tags.
     ;; - data-components + data-hash → localStorage cache
@@ -235,7 +235,7 @@
 ;; Component script with caching
 ;; --------------------------------------------------------------------------
 
-(define process-component-script
+(define process-component-script :effects [mutation io]
   (fn (script (text :as string))
     ;; Handle <script type="text/sx" data-components data-hash="...">
     (let ((hash (dom-get-attr script "data-hash")))
@@ -288,7 +288,7 @@
 
 (define _page-routes (list))
 
-(define process-page-scripts
+(define process-page-scripts :effects [mutation io]
   (fn ()
     ;; Process <script type="text/sx-pages"> tags.
     ;; Parses SX page registry and builds route entries with parsed patterns.
@@ -331,7 +331,7 @@
 ;; 5. Morph existing DOM to preserve structure, focus, scroll
 ;; 6. Store disposers on the element for cleanup
 
-(define sx-hydrate-islands
+(define sx-hydrate-islands :effects [mutation io]
   (fn (root)
     (let ((els (dom-query-all (or root (dom-body)) "[data-sx-island]")))
       (for-each
@@ -341,7 +341,7 @@
             (hydrate-island el)))
         els))))
 
-(define hydrate-island
+(define hydrate-island :effects [mutation io]
   (fn (el)
     (let ((name (dom-get-attr el "data-sx-island"))
           (state-sx (or (dom-get-attr el "data-sx-state") "{}")))
@@ -388,7 +388,7 @@
 ;; Island disposal — clean up when island removed from DOM
 ;; --------------------------------------------------------------------------
 
-(define dispose-island
+(define dispose-island :effects [mutation io]
   (fn (el)
     (let ((disposers (dom-get-data el "sx-disposers")))
       (when disposers
@@ -398,7 +398,7 @@
           disposers)
         (dom-set-data el "sx-disposers" nil)))))
 
-(define dispose-islands-in
+(define dispose-islands-in :effects [mutation io]
   (fn (root)
     ;; Dispose islands within root, but SKIP hydrated islands —
     ;; they may be preserved across morphs. Only dispose islands
@@ -419,7 +419,7 @@
 ;; Full boot sequence
 ;; --------------------------------------------------------------------------
 
-(define boot-init
+(define boot-init :effects [mutation io]
   (fn ()
     ;; Full browser initialization:
     ;; 1. CSS tracking