Merge PR #9: feat(soul): wire consciousness layers — L0->L1->L2->L3->L1 cycle

Resolves conflicts by keeping main's full safety/stewardship/imprint implementations.
PR #9 uniquely contributes: layered_cycle() in soul.el, route wiring in routes.el,
soul.elh export, and the layer composition test suite.

soul.el

@@ -8,6 +8,9 @@ import "chat.el"
 import "studio.el"
 import "elp-input.el"
 import "routes.el"
+import "safety.el"
+import "stewardship.el"
+import "imprint.el"
 
 cgi "neuron-soul" {
     dharma_id: "ntn-genesis@http://localhost:7770",
@@ -232,6 +235,71 @@ fn emit_session_start_event() -> Void {
     println("[soul] session-start event logged (boot=" + boot_num + " nodes=" + int_to_str(node_ct) + " edges=" + int_to_str(edge_ct) + ")")
 }
 
+// layered_cycle — routes user-facing requests through the 4-layer consciousness stack.
+// L0 (core) → L1 (safety screen) → L2a (continuity + behavioral profiling) → L2b (mission alignment) → L3 (imprint) → L1 (safety validate)
+// Internal cognition (heartbeat, proactive, memory ops) bypasses layers — use one_cycle directly.
+fn layered_cycle(raw_input: String) -> String {
+    let history: String = state_get("conversation_history")
+    let session_id: String = state_get("current_session_id")
+
+    // L1 in: safety screen
+    let screen_result: String = safety_screen(raw_input, history)
+    let screen_action: String = json_get(screen_result, "action")
+
+    // Hard bell: bypass all upper layers, log and escalate.
+    // Intentionally does NOT update conversation_history or call auto_persist():
+    // hard bell events are security-sensitive and must not appear in engram conversation
+    // history where they could leak context to subsequent turns. They are persisted
+    // separately by safety_log_bell() into the Episodic tier with restricted labels.
+    //
+    // safety_validate second param: when screen_action is "hard_bell", safety_validate
+    // receives the sentinel string "hard_bell" (not a normal screen action). The safety
+    // layer contract requires it to return a fixed refusal regardless of the output arg.
+    // On the normal path, safety_validate receives the original screen_action ("pass")
+    // so it can apply action-specific post-output checks.
+    if str_eq(screen_action, "hard_bell") {
+        safety_log_bell("hard", json_get(screen_result, "reason"), str_slice(raw_input, 0, 80))
+        return safety_validate("", "hard_bell")
+    }
+
+    let screened: String = json_get(screen_result, "content")
+
+    // L2a: continuity + behavioral profiling (also does mission alignment internally)
+    let continuity: String = steward_session_check(screened, session_id)
+    let cont_status: String = json_get(continuity, "status")
+    let cont_action: String = json_get(continuity, "action")
+
+    // Store continuity status so imprint can adjust its response register
+    state_set("session_continuity", cont_status)
+
+    // Identity anomaly: add a gentle verification cue to the input before imprint
+    let guided: String = if str_eq(cont_action, "identity_check") {
+        screened + " [steward:identity_check]"
+    } else {
+        if str_eq(cont_action, "soft_check") {
+            screened + " [steward:continuity_concern]"
+        } else {
+            screened
+        }
+    }
+
+    // L2b: mission alignment
+    let imprint_id: String = imprint_current()
+    let steward_result: String = steward_align(guided, imprint_id)
+    let steward_action: String = json_get(steward_result, "action")
+    let aligned: String = if str_eq(steward_action, "pass") {
+        json_get(steward_result, "content")
+    } else {
+        json_get(steward_result, "redirect_to")
+    }
+
+    // L3: imprint responds
+    let output: String = imprint_respond(aligned, imprint_id)
+
+    // L1 out: validate output before delivery
+    return safety_validate(output, screen_action)
+}
+
 let soul_cgi_id_raw: String = env("SOUL_CGI_ID")
 let soul_cgi_id: String = if str_eq(soul_cgi_id_raw, "") { "ntn-genesis" } else { soul_cgi_id_raw }
 let port_raw: String = env("NEURON_PORT")