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>

blog/bp/blog/admin/routes.py

@@ -15,6 +15,7 @@ from sqlalchemy import select, delete
 from shared.browser.app.authz import require_admin
 from shared.browser.app.utils.htmx import is_htmx_request
 from shared.browser.app.redis_cacher import invalidate_tag_cache
+from shared.sexp.helpers import sexp_response
 
 from models.tag_group import TagGroup, TagGroupTag
 from models.ghost_content import Tag
@@ -65,7 +66,7 @@ def register():
         if not is_htmx_request():
             return await make_response(await render_tag_groups_page(tctx))
         else:
-            return await make_response(await render_tag_groups_oob(tctx))
+            return sexp_response(await render_tag_groups_oob(tctx))
 
     @bp.post("/")
     @require_admin
@@ -130,7 +131,7 @@ def register():
         if not is_htmx_request():
             return await make_response(await render_tag_group_edit_page(tctx))
         else:
-            return await make_response(await render_tag_group_edit_oob(tctx))
+            return sexp_response(await render_tag_group_edit_oob(tctx))
 
     @bp.post("/<int:id>/")
     @require_admin

blog/bp/blog/routes.py

@@ -22,6 +22,7 @@ from .services.pages_data import pages_data
 from shared.browser.app.redis_cacher import cache_page, invalidate_tag_cache
 from shared.browser.app.utils.htmx import is_htmx_request
 from shared.browser.app.authz import require_admin
+from shared.sexp.helpers import sexp_response
 from shared.utils import host_url
 
 def register(url_prefix, title):
@@ -117,7 +118,7 @@ def register(url_prefix, title):
       post_slug = p_data["post"]["slug"]
 
       # Fetch container nav from relations service
-      container_nav_html = await fetch_fragment("relations", "container-nav", params={
+      container_nav = await fetch_fragment("relations", "container-nav", params={
           "container_type": "page",
           "container_id": str(db_post_id),
           "post_slug": post_slug,
@@ -126,7 +127,7 @@ def register(url_prefix, title):
       ctx = {
           **p_data,
           "base_title": get_config()["title"],
-          "container_nav_html": container_nav_html,
+          "container_nav": container_nav,
       }
 
       # Page cart badge via HTTP
@@ -149,9 +150,10 @@ def register(url_prefix, title):
       tctx.update(ctx)
       if not is_htmx_request():
           html = await render_home_page(tctx)
+          return await make_response(html)
       else:
-          html = await render_home_oob(tctx)
-      return await make_response(html)
+          sexp_src = await render_home_oob(tctx)
+          return sexp_response(sexp_src)
 
     @blogs_bp.get("/index")
     @blogs_bp.get("/index/")
@@ -186,11 +188,13 @@ def register(url_prefix, title):
           tctx.update(context)
           if not is_htmx_request():
               html = await render_blog_page(tctx)
+              return await make_response(html)
           elif q.page > 1:
-              html = await render_blog_page_cards(tctx)
+              sexp_src = await render_blog_page_cards(tctx)
+              return sexp_response(sexp_src)
           else:
-              html = await render_blog_oob(tctx)
-          return await make_response(html)
+              sexp_src = await render_blog_oob(tctx)
+              return sexp_response(sexp_src)
 
       # Default: posts listing
       # Drafts filter requires login; ignore if not logged in
@@ -227,12 +231,14 @@ def register(url_prefix, title):
       tctx.update(context)
       if not is_htmx_request():
           html = await render_blog_page(tctx)
+          return await make_response(html)
       elif q.page > 1:
-          html = await render_blog_cards(tctx)
+          # Sexp wire format — client renders blog cards
+          sexp_src = await render_blog_cards(tctx)
+          return sexp_response(sexp_src)
       else:
-          html = await render_blog_oob(tctx)
-
-      return await make_response(html)
+          sexp_src = await render_blog_oob(tctx)
+          return sexp_response(sexp_src)
 
     @blogs_bp.get("/new/")
     @require_admin
@@ -244,9 +250,10 @@ def register(url_prefix, title):
       tctx["editor_html"] = render_editor_panel()
       if not is_htmx_request():
         html = await render_new_post_page(tctx)
+        return await make_response(html)
       else:
-        html = await render_new_post_oob(tctx)
-      return await make_response(html)
+        sexp_src = await render_new_post_oob(tctx)
+        return sexp_response(sexp_src)
 
     @blogs_bp.post("/new/")
     @require_admin
@@ -325,9 +332,10 @@ def register(url_prefix, title):
       tctx["is_page"] = True
       if not is_htmx_request():
         html = await render_new_post_page(tctx)
+        return await make_response(html)
       else:
-        html = await render_new_post_oob(tctx)
-      return await make_response(html)
+        sexp_src = await render_new_post_oob(tctx)
+        return sexp_response(sexp_src)
 
     @blogs_bp.post("/new-page/")
     @require_admin