VM aser-slot → sx-page-full: single-call page render, 0.55s warm

Compiler fixes:
- Upvalue re-lookup returns own position (uv-index), not parent slot
- Spec: cek-call uses (make-env) not (dict) — OCaml Dict≠Env
- Bootstrap post-processes transpiler Dict→Env for cek_call

VM runtime fixes:
- compile_adapter evaluates constant defines (SPECIAL_FORM_NAMES etc.)
  via execute_module instead of wrapping as NativeFn closures
- Native primitives: map-indexed, some, every?
- Nil-safe HO forms: map/filter/for-each/some/every? accept nil as empty
- expand-components? set in kernel env (not just VM globals)
- unwrap_env diagnostic: reports actual type received

sx-page-full command:
- Single OCaml call: aser-slot body + render-to-html shell
- Eliminates two pipe round-trips (was: aser-slot→Python→shell render)
- Shell statics (component_defs, CSS, pages_sx) cached in Python,
  injected into kernel once, referenced by symbol in per-request command
- Large blobs use placeholder tokens — Python splices post-render,
  pipe transfers ~51KB instead of 2MB

Performance (warm):
- Server total: 0.55s (was ~2s)
- aser-slot VM: 0.3s, shell render: 0.01s, pipe: 0.06s
- kwargs computation: 0.000s (cached)

SX_STANDALONE mode for sx_docs dev (skips fragment fetches).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hosts/ocaml/lib/sx_primitives.ml

@@ -618,20 +618,44 @@ let () =
     match args with
     | [f; (List items | ListRef { contents = items })] ->
       List (List.map (fun x -> call_any f [x]) items)
+    | [_; Nil] -> List []
     | _ -> raise (Eval_error "map: expected (fn list)"));
+  register "map-indexed" (fun args ->
+    match args with
+    | [f; (List items | ListRef { contents = items })] ->
+      List (List.mapi (fun i x -> call_any f [Number (float_of_int i); x]) items)
+    | [_; Nil] -> List []
+    | _ -> raise (Eval_error "map-indexed: expected (fn list)"));
   register "filter" (fun args ->
     match args with
     | [f; (List items | ListRef { contents = items })] ->
       List (List.filter (fun x -> sx_truthy (call_any f [x])) items)
+    | [_; Nil] -> List []
     | _ -> raise (Eval_error "filter: expected (fn list)"));
   register "for-each" (fun args ->
     match args with
     | [f; (List items | ListRef { contents = items })] ->
       List.iter (fun x -> ignore (call_any f [x])) items; Nil
-    | _ -> raise (Eval_error "for-each: expected (fn list)"));
+    | [_; Nil] -> Nil  (* nil collection = no-op *)
+    | _ ->
+      let types = String.concat ", " (List.map (fun v -> type_of v) args) in
+      raise (Eval_error (Printf.sprintf "for-each: expected (fn list), got (%s) %d args" types (List.length args))));
   register "reduce" (fun args ->
     match args with
     | [f; init; (List items | ListRef { contents = items })] ->
       List.fold_left (fun acc x -> call_any f [acc; x]) init items
     | _ -> raise (Eval_error "reduce: expected (fn init list)"));
+  register "some" (fun args ->
+    match args with
+    | [f; (List items | ListRef { contents = items })] ->
+      (try List.find (fun x -> sx_truthy (call_any f [x])) items
+       with Not_found -> Bool false)
+    | [_; Nil] -> Bool false
+    | _ -> raise (Eval_error "some: expected (fn list)"));
+  register "every?" (fun args ->
+    match args with
+    | [f; (List items | ListRef { contents = items })] ->
+      Bool (List.for_all (fun x -> sx_truthy (call_any f [x])) items)
+    | [_; Nil] -> Bool true
+    | _ -> raise (Eval_error "every?: expected (fn list)"));
   ()