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/all_events/routes.py

@@ -14,6 +14,7 @@ from __future__ import annotations
 from quart import Blueprint, g, request, render_template, make_response
 
 from shared.browser.app.utils.htmx import is_htmx_request
+from shared.sexp.helpers import sexp_response
 from shared.infrastructure.cart_identity import current_cart_identity
 from shared.infrastructure.data_client import fetch_data
 from shared.contracts.dtos import PostDTO, dto_from_dict
@@ -70,11 +71,11 @@ def register() -> Blueprint:
 
         ctx = await get_template_context()
         if is_htmx_request():
-            html = await render_all_events_oob(ctx, entries, has_more, pending_tickets, page_info, page, view)
+            sexp_src = await render_all_events_oob(ctx, entries, has_more, pending_tickets, page_info, page, view)
+            return sexp_response(sexp_src)
         else:
             html = await render_all_events_page(ctx, entries, has_more, pending_tickets, page_info, page, view)
-
-        return await make_response(html, 200)
+            return await make_response(html, 200)
 
     @bp.get("/all-entries")
     async def entries_fragment():
@@ -84,8 +85,8 @@ def register() -> Blueprint:
         entries, has_more, pending_tickets, page_info = await _load_entries(page)
 
         from sexp.sexp_components import render_all_events_cards
-        html = await render_all_events_cards(entries, has_more, pending_tickets, page_info, page, view)
-        return await make_response(html, 200)
+        sexp_src = await render_all_events_cards(entries, has_more, pending_tickets, page_info, page, view)
+        return sexp_response(sexp_src)
 
     @bp.post("/all-tickets/adjust")
     async def adjust_ticket():
@@ -127,6 +128,6 @@ def register() -> Blueprint:
         from sexp.sexp_components import render_ticket_widget
         widget_html = render_ticket_widget(entry, qty, "/all-tickets/adjust")
         mini_html = await fetch_fragment("cart", "cart-mini", params=frag_params, required=False)
-        return await make_response(widget_html + mini_html, 200)
+        return sexp_response(widget_html + (mini_html or ""))
 
     return bp