chore: the compiler is a build input too, and regenerate under the fixed elc

Installing the fixed compiler exposed a blind spot in this gate. On clean main,
with no source changed, soulc-stamp reported OK while the committed amalgam had
gone stale by a line — because the fingerprint covered .el sources and not the
toolchain that turns them into dist/soul.c. That is exactly the class of silent
divergence the gate was written to close, and it had it.

The stamp now fingerprints the elc binary alongside the sources. Demonstrated: with
the old stamp the gate passed after a compiler swap; with this change the same
condition fails, naming __compiler__.

dist/soul.c regenerated under the installed compiler (1,205,027 bytes) and verified:
builds from its own committed input, the declared principal is present in the
resulting binary, interface 110 routes in / 110 out.

Differential evidence that the new compiler is a strict superset — same sources,
both compilers:
  neuron soul        1 differing line, the el_cgi_init emission
  engram server.el   0 differing lines
  mcp-wrapper        0 differing lines
  mcp-proxy          0 differing lines

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

dist/soul.c

@@ -31938,6 +31938,7 @@ el_val_t layered_cycle(el_val_t raw_input, el_val_t session_id, el_val_t utility
 
 int main(int _argc, char** _argv) {
   el_runtime_init_args(_argc, _argv);
+  el_cgi_init(EL_STR("neuron-soul"), EL_STR("ntn-genesis@http://localhost:7770"), EL_STR("william-christopher-anderson"), EL_STR("dharma-mainnet"), EL_STR("http://localhost:8742"));
   soul_cgi_id_raw = env(EL_STR("SOUL_CGI_ID"));
   soul_cgi_id = ({ el_val_t _if_result_821 = 0; if (str_eq(soul_cgi_id_raw, EL_STR(""))) { _if_result_821 = (EL_STR("ntn-genesis")); } else { _if_result_821 = (soul_cgi_id_raw); } _if_result_821; });
   port_raw = env(EL_STR("NEURON_PORT"));