Create sei.js

sei.js

@@ -0,0 +1,44 @@
+// sei.js
+// Signal Ecology Integration (SEI)
+// Deterministic ecological index for Meaning Units (MU)
+
+const fs = require('fs');
+const path = require('path');
+
+const SEI_PATH = path.join(__dirname, 'sei.json');
+
+// Ensure SEI index exists
+function ensureSEI() {
+  if (!fs.existsSync(SEI_PATH)) {
+    fs.writeFileSync(SEI_PATH, JSON.stringify({
+      seiVersion: "v0.1",
+      species: []
+    }, null, 2));
+  }
+}
+
+// Register MU as a species in the ecology
+function registerSpecies(mu) {
+  ensureSEI();
+
+  const sei = JSON.parse(fs.readFileSync(SEI_PATH, 'utf8'));
+
+  // Species entry (deterministic, no semantics)
+  const speciesEntry = {
+    id: mu.id,
+    length: mu.payload.length,
+    type: mu.payload.type,
+    compiledAt: mu.compiledAt,
+    ecologicalClass: "meaning-unit",   // substrate-level class
+    driftPotential: 0,                 // DSLO v0: no drift allowed
+    stability: "deterministic"
+  };
+
+  sei.species.push(speciesEntry);
+
+  fs.writeFileSync(SEI_PATH, JSON.stringify(sei, null, 2));
+
+  return sei;
+}
+
+module.exports = { registerSpecies };