Remove render_to_sx from public API: enforce sx_call for all service code

Replace ~250 render_to_sx calls across all services with sync sx_call,
converting many async functions to sync where no other awaits remained.
Make render_to_sx/render_to_sx_with_env private (_render_to_sx).
Add (post-header-ctx) IO primitive and shared post/post-admin defmacros.
Convert built-in post/post-admin layouts from Python to register_sx_layout
with .sx defcomps. Remove dead post_admin_mobile_nav_sx.

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

blog/bp/blog/routes.py

@@ -21,7 +21,7 @@ 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.sx.helpers import sx_response, render_to_sx
+from shared.sx.helpers import sx_response, sx_call
 from shared.utils import host_url
 
 def register(url_prefix, title):
@@ -67,7 +67,7 @@ def register(url_prefix, title):
         from shared.sx.helpers import root_header_sx, full_page_sx
         from shared.sx.parser import SxExpr
         root_hdr = await root_header_sx(tctx)
-        blog_hdr = await render_to_sx("menu-row-sx",
+        blog_hdr = sx_call("menu-row-sx",
             id="blog-row", level=1,
             link_label_content=SxExpr("(div)"),
             child_id="blog-header-child")
@@ -132,7 +132,7 @@ def register(url_prefix, title):
 
       from shared.sx.page import get_template_context
       from shared.sx.helpers import (
-          render_to_sx, root_header_sx, full_page_sx, oob_page_sx,
+          sx_call, root_header_sx, full_page_sx, oob_page_sx,
           post_header_sx, oob_header_sx, mobile_menu_sx,
           post_mobile_nav_sx, mobile_root_nav_sx,
       )
@@ -143,11 +143,11 @@ def register(url_prefix, title):
       tctx.update(ctx)
 
       post = ctx.get("post", {})
-      content = await render_to_sx("blog-home-main",
+      content = sx_call("blog-home-main",
           html_content=post.get("html", ""),
           sx_content=SxExpr(post.get("sx_content", "")) if post.get("sx_content") else None)
       meta_data = services.blog_page.post_meta_data(post, ctx.get("base_title", ""))
-      meta = await render_to_sx("blog-meta", **meta_data)
+      meta = sx_call("blog-meta", **meta_data)
 
       if not is_htmx_request():
           root_hdr = await root_header_sx(tctx)
@@ -171,12 +171,12 @@ def register(url_prefix, title):
       """Blog listing — moved from / to /index."""
       from shared.services.registry import services
       from shared.sx.helpers import (
-          render_to_sx, root_header_sx, full_page_sx, oob_page_sx, oob_header_sx,
+          sx_call, root_header_sx, full_page_sx, oob_page_sx, oob_header_sx,
       )
       from shared.sx.parser import SxExpr
 
-      async def _blog_hdr(ctx, oob=False):
-          return await render_to_sx("menu-row-sx",
+      def _blog_hdr(ctx, oob=False):
+          return sx_call("menu-row-sx",
               id="blog-row", level=1,
               link_label_content=SxExpr("(div)"),
               child_id="blog-header-child", oob=oob)
@@ -184,16 +184,16 @@ def register(url_prefix, title):
       data = await services.blog_page.index_data(g.s)
 
       # Render content, aside, and filter via .sx defcomps
-      content = await render_to_sx("blog-index-main-content", **data)
-      aside = await render_to_sx("blog-index-aside-content", **data)
-      filter_sx = await render_to_sx("blog-index-filter-content", **data)
+      content = sx_call("blog-index-main-content", **data)
+      aside = sx_call("blog-index-aside-content", **data)
+      filter_sx = sx_call("blog-index-filter-content", **data)
 
       from shared.sx.page import get_template_context
       tctx = await get_template_context()
 
       if not is_htmx_request():
           root_hdr = await root_header_sx(tctx)
-          blog_hdr = await _blog_hdr(tctx)
+          blog_hdr = _blog_hdr(tctx)
           header_rows = "(<> " + root_hdr + " " + blog_hdr + ")"
           html = await full_page_sx(tctx, header_rows=header_rows,
                                     content=content, aside=aside, filter=filter_sx)
@@ -203,7 +203,7 @@ def register(url_prefix, title):
           return sx_response(content)
       else:
           root_hdr = await root_header_sx(tctx)
-          blog_hdr = await _blog_hdr(tctx)
+          blog_hdr = _blog_hdr(tctx)
           rows = "(<> " + root_hdr + " " + blog_hdr + ")"
           header_oob = await oob_header_sx("root-header-child", "blog-header-child", rows)
           sx_src = await oob_page_sx(oobs=header_oob, content=content,
@@ -231,7 +231,7 @@ def register(url_prefix, title):
         from shared.sx.page import get_template_context
         from sxc.pages.renders import render_editor_panel
         tctx = await get_template_context()
-        tctx["editor_html"] = await render_editor_panel(save_error="Invalid JSON in editor content.")
+        tctx["editor_html"] = render_editor_panel(save_error="Invalid JSON in editor content.")
         html = await _render_new_post_page(tctx)
         return await make_response(html, 400)
 
@@ -240,7 +240,7 @@ def register(url_prefix, title):
         from shared.sx.page import get_template_context
         from sxc.pages.renders import render_editor_panel
         tctx = await get_template_context()
-        tctx["editor_html"] = await render_editor_panel(save_error=reason)
+        tctx["editor_html"] = render_editor_panel(save_error=reason)
         html = await _render_new_post_page(tctx)
         return await make_response(html, 400)
 
@@ -287,7 +287,7 @@ def register(url_prefix, title):
         from shared.sx.page import get_template_context
         from sxc.pages.renders import render_editor_panel
         tctx = await get_template_context()
-        tctx["editor_html"] = await render_editor_panel(save_error="Invalid JSON in editor content.", is_page=True)
+        tctx["editor_html"] = render_editor_panel(save_error="Invalid JSON in editor content.", is_page=True)
         tctx["is_page"] = True
         html = await _render_new_post_page(tctx)
         return await make_response(html, 400)
@@ -297,7 +297,7 @@ def register(url_prefix, title):
         from shared.sx.page import get_template_context
         from sxc.pages.renders import render_editor_panel
         tctx = await get_template_context()
-        tctx["editor_html"] = await render_editor_panel(save_error=reason, is_page=True)
+        tctx["editor_html"] = render_editor_panel(save_error=reason, is_page=True)
         tctx["is_page"] = True
         html = await _render_new_post_page(tctx)
         return await make_response(html, 400)