chore(rebirth): establish v3 cutover gates

tests/rebirth-phase0.mjs

@@ -0,0 +1,67 @@
+// ST-BME restrained rebirth — Phase 0 policy characterization.
+
+import assert from "node:assert/strict";
+import {
+  LEGACY_DATA_RUNTIME_POLICY,
+  LEGACY_DATA_SOURCES,
+  PHASE0_BACKUP_CHECKLIST,
+  REBIRTH_FORMAT_VERSION,
+  V3_STORAGE_NAMESPACES,
+  getRebirthPhase0Inventory,
+  shouldV3RuntimeReadLegacySource,
+} from "../runtime/rebirth-policy.mjs";
+
+assert.equal(REBIRTH_FORMAT_VERSION, 3);
+
+for (const [key, namespace] of Object.entries(V3_STORAGE_NAMESPACES)) {
+  assert.match(namespace, /v3/, `${key} namespace must be versioned as v3`);
+}
+assert.equal(new Set(Object.values(V3_STORAGE_NAMESPACES)).size, Object.keys(V3_STORAGE_NAMESPACES).length);
+
+console.log("  ✓ v3 namespaces are explicit and collision-resistant");
+
+assert.equal(LEGACY_DATA_RUNTIME_POLICY.permanentRuntimeLegacyRead, false);
+assert.equal(LEGACY_DATA_RUNTIME_POLICY.darkReadDualWriteMigration, false);
+assert.deepEqual(LEGACY_DATA_RUNTIME_POLICY.allowedLegacyAccess, [
+  "one-shot-importer",
+  "explicit-export",
+  "manual-reset",
+]);
+assert.equal(LEGACY_DATA_RUNTIME_POLICY.fallbackWhenNoImporter, "rebuild-from-chat-history");
+
+for (const source of LEGACY_DATA_SOURCES) {
+  assert.equal(source.runtimeAction, "ignore", `${source.id} must remain inert for v3 runtime`);
+  assert.equal(
+    shouldV3RuntimeReadLegacySource(source.id),
+    false,
+    `${source.id} must not be read by the v3 runtime`,
+  );
+  assert.notEqual(source.phase0Action, "runtime-read", `${source.id} must not plan a runtime read`);
+}
+
+for (const requiredSource of [
+  "metadata-full-legacy",
+  "commit-marker-legacy",
+  "vector-manifest-legacy",
+  "authority-sql-legacy",
+]) {
+  assert.ok(
+    LEGACY_DATA_SOURCES.some((source) => source.id === requiredSource),
+    `${requiredSource} must be represented in Phase 0 policy`,
+  );
+}
+
+console.log("  ✓ legacy sources are inert for the v3 runtime");
+
+const inventory = getRebirthPhase0Inventory();
+assert.equal(inventory.formatVersion, 3);
+assert.equal(inventory.policy.permanentRuntimeLegacyRead, false);
+assert.equal(inventory.policy.fallbackWhenNoImporter, "rebuild-from-chat-history");
+assert.equal(inventory.namespaces.authorityGraph, "authority-graph-v3");
+assert.equal(inventory.namespaces.lukerSidecar, "luker-graph-v3");
+assert.ok(inventory.legacyDataSources.length >= 6);
+assert.ok(PHASE0_BACKUP_CHECKLIST.some((item) => item.id === "manual-graph-export"));
+assert.ok(PHASE0_BACKUP_CHECKLIST.some((item) => item.id === "authority-reset-plan"));
+
+console.log("  ✓ Phase 0 inventory exposes backup and cutover gates");
+console.log("rebirth-phase0 tests passed");