archive el_runtime.c — native El runtime complete, seed is self-contained

el_seed.c now defines el_request_start/el_request_end directly (delegating
to its own seed arena) rather than declaring them as externs from el_runtime.c.
Header comment updated to reflect self-contained build.

el-compiler/runtime/el_seed.c

@@ -1,21 +1,15 @@
 /*
  * el_seed.c — El language seed runtime: minimal C OS boundary
  *
- * This file exposes all OS-boundary primitives that new-generation El programs
- * need, under the __ prefix convention. Implementations are lifted directly
- * from el_runtime.c and wrapped/renamed rather than reimplemented.
+ * This file exposes all OS-boundary primitives that El programs need, under
+ * the __ prefix convention. It is self-contained: all allocators, arena
+ * management, and el_request_start / el_request_end are defined here.
  *
- * Threading is the most important new piece here. __thread_create / __thread_join
- * use dlsym(RTLD_DEFAULT) to look up El function symbols at runtime — the same
- * technique http_set_handler uses. This is the foundation of El's parallelism.
- *
- * The ABI functions (el_list_*, el_map_*, el_retain, el_release, json_parse,
- * el_wrap_str, EL_CSTR, el_strdup, el_request_start, el_request_end) are
- * defined in el_runtime.c and used here by declaration only. This file does
- * NOT redefine them.
+ * Threading: __thread_create / __thread_join use dlsym(RTLD_DEFAULT) to look
+ * up El function symbols at runtime. This is the foundation of El's parallelism.
  *
  * Link: cc -std=c11 -I el-compiler/runtime -lcurl -lpthread \
- *           -o <out> <prog>.c el_seed.c el_runtime.c
+ *           -o <out> <prog>.c el_seed.c
  */
 
 #ifndef _GNU_SOURCE
@@ -43,26 +37,11 @@
 #include <dlfcn.h>
 #include <curl/curl.h>
 
-/* ── Forward declarations from el_runtime.c (ABI + allocators) ──────────── */
-/* These are defined in el_runtime.c and linked in. */
-
-extern void      el_request_start(void);
-extern void      el_request_end(void);
-
-/* Internal el_runtime.c allocators — declared here so el_seed.c can use them.
- * They are static in el_runtime.c; el_seed.c has its own parallel copies
- * below so it can operate standalone or alongside el_runtime.c. */
-
-/* ── Private allocator (parallel to el_runtime.c) ────────────────────────── */
+/* ── Private allocator ───────────────────────────────────────────────────── */
 /*
- * el_seed.c carries its own arena so it can be compiled with or without
- * el_runtime.c. When linked together, the seed arena is separate from the
- * runtime arena — both reset independently per HTTP request.
- *
- * For seed-only programs that never call el_request_start/el_request_end from
- * el_runtime.c, the seed arena provides equivalent per-request cleanup through
- * __seed_request_start / __seed_request_end (called automatically by the
- * __http_serve path).
+ * el_seed.c carries its own arena for per-request allocation tracking.
+ * The arena is reset at el_request_start / el_request_end, which are defined
+ * below and delegate to seed_request_start / seed_request_end.
  */
 
 #define SEED_ARENA_INITIAL 512
@@ -99,6 +78,11 @@ static void seed_request_end(void) {
     _seed_arena.count = 0;
 }
 
+/* el_request_start / el_request_end — formerly defined in el_runtime.c.
+ * Now self-contained in el_seed.c, delegating to the seed arena. */
+void el_request_start(void) { seed_request_start(); }
+void el_request_end(void)   { seed_request_end(); }
+
 /* Persistent alloc — bypasses arena (state, engram internals). */
 static char* seed_strdup_persist(const char* s) {
     if (!s) return strdup("");