Merge branch 'stage' into feat/windows-el-runtime

Resolve el_runtime.c conflict: include both sys/resource.h (from stage)
and el_closesocket POSIX shim (from Windows port) within the #else block.

lang/el-compiler/runtime/el_runtime.h

@@ -182,6 +182,7 @@ el_val_t  http_set_handler(el_val_t name);
  * existing handlers (e.g. products/web/server.el): it dispatches with
  * (method, path, body), hardcodes 200 OK, and auto-detects content type. */
 el_val_t  http_serve_v2(el_val_t port, el_val_t handler);
+void      http_serve_async(el_val_t port, el_val_t handler);
 el_val_t  http_set_handler_v2(el_val_t name);
 
 /* Build an HTTP response envelope. `headers_json` should be a JSON object
@@ -233,6 +234,8 @@ el_val_t  url_decode(el_val_t s);   /* '+' → space, %XX → byte  */
  *     {"p":[],"a":["href","title"],"strong":[],...}
  * where each value is the array of attribute names allowed for that tag. */
 el_val_t  el_html_sanitize(el_val_t input_html, el_val_t allowlist_json);
+el_val_t  html_raw(el_val_t s);
+el_val_t  html_escape(el_val_t s);
 
 /* ── Filesystem ──────────────────────────────────────────────────────────── */
 
@@ -537,6 +540,12 @@ el_val_t  parse_int(el_val_t s, el_val_t default_val);
 el_val_t  exit_program(el_val_t code);
 el_val_t  getpid_now(void);
 
+/* Self-terminating memory guard. Reads ELC_MAX_MEM_MB (default 512) and
+ * exits with code 1 if resident memory exceeds the limit. Call periodically
+ * during long compilation loops (e.g. after each function is compiled).
+ * Returns 0 when memory is within bounds.                                   */
+el_val_t  el_mem_check(void);
+
 /* ── CGI identity ─────────────────────────────────────────────────────────────
  * Called at the start of main() in CGI programs (those with a `cgi {}` block).
  * Records the program's DHARMA identity before any other code executes.      */
@@ -636,6 +645,12 @@ el_val_t  engram_list_layers_json(void);
  * no nodes promoted to working memory. */
 el_val_t  engram_compile_layered_json(el_val_t intent, el_val_t depth);
 
+/* ── Working memory ──────────────────────────────────────────────────────────*/
+el_val_t  engram_wm_count(void);
+el_val_t  engram_wm_avg_weight(void);
+el_val_t  engram_wm_top_json(el_val_t n);
+el_val_t  engram_load_merge(el_val_t path);
+
 /* ── LLM (Anthropic API client) ─────────────────────────────────────────────
  * All functions call https://api.anthropic.com/v1/messages with the API key
  * from env ANTHROPIC_API_KEY. Default model when empty: claude-sonnet-4-5. */