Fix island state loss on SX navigation + cache busting

Island markers rendered during SX navigation responses had no
data-sx-state attribute, so hydration found empty kwargs and path
was nil in the copyright display. Now adapter-dom.sx serializes
keyword args into data-sx-state on island markers, matching what
adapter-html.sx does for SSR.

Also fix post-swap to use parent element for outerHTML swaps in
SX responses (was using detached old target). Add SX source file
hashes to wasm_hash for proper browser cache busting — changing
any .sx file now busts the cache. Remove stale .sxbc bytecode
cache files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/orchestration.sx

@@ -299,7 +299,11 @@
                     ()
                     (let
                       ((swap-result (swap-dom-nodes target content swap-style)))
-                      (post-swap (or swap-result target)))))))))))))
+                      (post-swap
+                        (if
+                          (= swap-style "outerHTML")
+                          (dom-parent (or swap-result target))
+                          (or swap-result target))))))))))))))
 
 (define
   handle-html-response
@@ -325,8 +329,15 @@
                 use-transition
                 (fn
                   ()
-                  (swap-html-string target html swap-style)
-                  (post-swap target))))
+                  (let
+                    ((swap-root (swap-html-string target html swap-style)))
+                    (log-info
+                      (str
+                        "swap-root: "
+                        (if swap-root (dom-tag-name swap-root) "nil")
+                        " target: "
+                        (dom-tag-name target)))
+                    (post-swap (or swap-root target))))))
             (let
               ((container (dom-create-element "div" nil)))
               (dom-set-inner-html container (dom-body-inner-html doc))