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>

test/bp/dashboard/routes.py

@@ -14,7 +14,7 @@ def register(url_prefix: str = "/") -> Blueprint:
         """Full page dashboard with last results."""
         from shared.sexp.page import get_template_context
         from shared.browser.app.csrf import generate_csrf_token
-        from sexp.sexp_components import render_dashboard_page
+        from sexp.sexp_components import render_dashboard_page_sexp
         import runner
 
         ctx = await get_template_context()
@@ -24,7 +24,7 @@ def register(url_prefix: str = "/") -> Blueprint:
         active_filter = request.args.get("filter")
         active_service = request.args.get("service")
 
-        html = await render_dashboard_page(
+        html = await render_dashboard_page_sexp(
             ctx, result, running, csrf,
             active_filter=active_filter,
             active_service=active_service,
@@ -40,7 +40,7 @@ def register(url_prefix: str = "/") -> Blueprint:
             asyncio.create_task(runner.run_tests())
 
         # HX-Redirect for HTMX, regular redirect for non-HTMX
-        if request.headers.get("HX-Request"):
+        if request.headers.get("SX-Request") or request.headers.get("HX-Request"):
             resp = Response("", status=200)
             resp.headers["HX-Redirect"] = "/"
             return resp
@@ -58,7 +58,7 @@ def register(url_prefix: str = "/") -> Blueprint:
             from quart import abort
             abort(404)
 
-        is_htmx = bool(request.headers.get("HX-Request"))
+        is_htmx = bool(request.headers.get("SX-Request") or request.headers.get("HX-Request"))
 
         if is_htmx:
             # S-expression wire format — sexp.js renders client-side
@@ -68,17 +68,17 @@ def register(url_prefix: str = "/") -> Blueprint:
 
         # Full page render (direct navigation / refresh)
         from shared.sexp.page import get_template_context
-        from sexp.sexp_components import render_test_detail_page
+        from sexp.sexp_components import render_test_detail_page_sexp
 
         ctx = await get_template_context()
-        html = await render_test_detail_page(ctx, test)
+        html = await render_test_detail_page_sexp(ctx, test)
         return await make_response(html, 200)
 
     @bp.get("/results")
     async def results():
         """HTMX partial — poll target for results table."""
         from shared.browser.app.csrf import generate_csrf_token
-        from sexp.sexp_components import render_results_partial
+        from sexp.sexp_components import render_results_partial_sexp
         import runner
 
         result = runner.get_results()
@@ -87,7 +87,7 @@ def register(url_prefix: str = "/") -> Blueprint:
         active_filter = request.args.get("filter")
         active_service = request.args.get("service")
 
-        html = await render_results_partial(
+        html = await render_results_partial_sexp(
             result, running, csrf,
             active_filter=active_filter,
             active_service=active_service,