Send all responses as sexp wire format with client-side rendering

- Server sends sexp source text, client (sexp.js) renders everything
- SexpExpr marker class for nested sexp composition in serialize()
- sexp_page() HTML shell with data-mount="body" for full page loads
- sexp_response() returns text/sexp for OOB/partial responses
- ~app-body layout component replaces ~app-layout (no raw!)
- ~rich-text is the only component using raw! (for CMS HTML content)
- Fragment endpoints return text/sexp, auto-wrapped in SexpExpr
- All _*_html() helpers converted to _*_sexp() returning sexp source
- Head auto-hoist: sexp.js moves meta/title/link/script[ld+json]
  from rendered body to document.head automatically
- Unknown components render warning box instead of crashing page
- Component kwargs preserve AST for lazy rendering (fixes <> in kwargs)
- Fix unterminated paren in events/sexp/tickets.sexpr

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

orders/bp/fragments/routes.py

@@ -14,12 +14,11 @@ def register():
 
     async def _account_nav_item():
         from shared.infrastructure.urls import orders_url
-        from shared.sexp.jinja_bridge import sexp as render_sexp
+        from shared.sexp.helpers import sexp_call
 
-        return render_sexp(
-            '(~account-nav-item :href href :label "orders")',
-            href=orders_url("/"),
-        )
+        return sexp_call("account-nav-item",
+                         href=orders_url("/"),
+                         label="orders")
 
     _handlers = {
         "account-nav-item": _account_nav_item,
@@ -34,8 +33,8 @@ def register():
     async def get_fragment(fragment_type: str):
         handler = _handlers.get(fragment_type)
         if handler is None:
-            return Response("", status=200, content_type="text/html")
-        html = await handler()
-        return Response(html, status=200, content_type="text/html")
+            return Response("", status=200, content_type="text/sexp")
+        src = await handler()
+        return Response(src, status=200, content_type="text/sexp")
 
     return bp

orders/bp/order/routes.py

@@ -55,9 +55,11 @@ def register() -> Blueprint:
 
         if not is_htmx_request():
             html = await render_order_page(ctx, order, calendar_entries, url_for)
+            return await make_response(html)
         else:
-            html = await render_order_oob(ctx, order, calendar_entries, url_for)
-        return await make_response(html)
+            from shared.sexp.helpers import sexp_response
+            sexp_src = await render_order_oob(ctx, order, calendar_entries, url_for)
+            return sexp_response(sexp_src)
 
     @bp.get("/pay/")
     async def order_pay(order_id: int):

orders/bp/orders/routes.py

@@ -131,17 +131,22 @@ def register(url_prefix: str) -> Blueprint:
                 ctx, orders, page, total_pages, search, total_count,
                 url_for, qs_fn,
             )
+            resp = await make_response(html)
         elif page > 1:
-            html = await render_orders_rows(
+            # Sexp wire format — client renders order rows
+            from shared.sexp.helpers import sexp_response
+            sexp_src = await render_orders_rows(
                 ctx, orders, page, total_pages, url_for, qs_fn,
             )
+            resp = sexp_response(sexp_src)
         else:
-            html = await render_orders_oob(
+            from shared.sexp.helpers import sexp_response
+            sexp_src = await render_orders_oob(
                 ctx, orders, page, total_pages, search, total_count,
                 url_for, qs_fn,
             )
+            resp = sexp_response(sexp_src)
 
-        resp = await make_response(html)
         resp.headers["Hx-Push-Url"] = _current_url_without_page()
         return _vary(resp)