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>

events/bp/ticket_admin/routes.py

@@ -20,6 +20,7 @@ from sqlalchemy.orm import selectinload
 from models.calendars import CalendarEntry, Ticket, TicketType
 from shared.browser.app.authz import require_admin
 from shared.browser.app.redis_cacher import clear_cache
+from shared.sexp.helpers import sexp_response
 
 from ..tickets.services.tickets import (
     get_ticket_by_code,
@@ -76,10 +77,10 @@ def register() -> Blueprint:
         ctx = await get_template_context()
         if not is_htmx_request():
             html = await render_ticket_admin_page(ctx, tickets, stats)
+            return await make_response(html, 200)
         else:
-            html = await render_ticket_admin_oob(ctx, tickets, stats)
-
-        return await make_response(html, 200)
+            sexp_src = await render_ticket_admin_oob(ctx, tickets, stats)
+            return sexp_response(sexp_src)
 
     @bp.get("/entry/<int:entry_id>/")
     @require_admin
@@ -102,7 +103,7 @@ def register() -> Blueprint:
 
         from sexp.sexp_components import render_entry_tickets_admin
         html = render_entry_tickets_admin(entry, tickets)
-        return await make_response(html, 200)
+        return sexp_response(html)
 
     @bp.get("/lookup/")
     @require_admin
@@ -118,11 +119,9 @@ def register() -> Blueprint:
         ticket = await get_ticket_by_code(g.s, code)
         from sexp.sexp_components import render_lookup_result
         if not ticket:
-            html = render_lookup_result(None, "Ticket not found")
-            return await make_response(html, 200)
+            return sexp_response(render_lookup_result(None, "Ticket not found"))
 
-        html = render_lookup_result(ticket, None)
-        return await make_response(html, 200)
+        return sexp_response(render_lookup_result(ticket, None))
 
     @bp.post("/<code>/checkin/")
     @require_admin
@@ -133,11 +132,9 @@ def register() -> Blueprint:
 
         from sexp.sexp_components import render_checkin_result
         if not success:
-            html = render_checkin_result(False, error, None)
-            return await make_response(html, 200)
+            return sexp_response(render_checkin_result(False, error, None))
 
         ticket = await get_ticket_by_code(g.s, code)
-        html = render_checkin_result(True, None, ticket)
-        return await make_response(html, 200)
+        return sexp_response(render_checkin_result(True, None, ticket))
 
     return bp