soul: per-tick arena bracketing in awareness_run + hand-patched dist/soul.c

awareness_run's while-loop ran outside any request arena, so every
allocation in every 1s tick (search JSON, heartbeat payloads, curiosity
activations) was treated as permanent by the runtime — 7.5GB RSS in
under a minute. Bracket each iteration with el_arena_push/el_arena_pop
(same pattern the compiler emits for scoped blocks; state_set/state_get
persist separately via el_strdup_persist and are unaffected).

dist/soul.c carries the same change hand-patched at the compiled
awareness_run site — elc is currently unsafe to run locally (pathological
memory on sessions.el), so the generated C was patched to match the
source, verified line-for-line against the compiler's own conventions.

MUST be paired with el repo PR #64 (el_strdup_persist for stored engram
fields): per-tick arena reclamation widens the write-corruption window
without it. Verified together: 5h live soak on the recovered production
snapshot, flat RSS, write-field-integrity clean.

Note: dist/soul.c still needs a full elc regen to pick up PR #73's
source changes (consent tiers) — tracked separately; this patch does not
regress that (those changes were never in dist).

chat.elh

@@ -17,7 +17,9 @@ extern fn id_in_seen(node_id: String, seen: String) -> Bool
 extern fn add_to_seen(seen: String, node_id: String) -> String
 extern fn engram_extract_ids(nodes_json: String) -> String
 extern fn engram_compile(intent: String) -> String
+extern fn distill_transcript(transcript: String) -> String
 extern fn json_safe(s: String) -> String
+extern fn current_engine_note(model: String) -> String
 extern fn build_system_prompt(ctx: String, chat_mode: Bool) -> String
 extern fn hist_append(hist: String, role: String, content: String) -> String
 extern fn hist_trim(hist: String) -> String
@@ -30,6 +32,10 @@ extern fn handle_chat(body: String) -> String
 extern fn handle_see(body: String) -> String
 extern fn studio_tools_json() -> String
 extern fn agentic_api_key() -> String
+extern fn llm_base_url() -> String
+extern fn llm_wire_format() -> String
+extern fn json_escape(s: String) -> String
+extern fn openai_chat_complete(model: String, base_url: String, api_key: String, safe_sys: String, messages_json: String) -> String
 extern fn agentic_tools_literal() -> String
 extern fn agentic_tools_with_web() -> String
 extern fn connector_tools_json() -> String