Advance CUST-WP-0025: close T16/T17, add canon and fin-hub bootstrap

- Mark T16/T17 done with cutover evidence and decision coupling doc
- Add business-model-canvas and bootstrap-protocol canon (T20/T21)
- Record Core Hub readiness-summary evidence stubs
- Refresh fos-hub-bootstrap-sequence-status and core-hub-replacement-evidence

docs/evidence/core-hub-readiness-summary-20260708.json

@@ -0,0 +1,41 @@
+{
+  "ok": true,
+  "readyForCutover": true,
+  "openGates": ["legacy_inter_hub_reference"],
+  "gates": [
+    {
+      "name": "deployed_api_smoke",
+      "ok": true,
+      "reason": "ok",
+      "evidence": {
+        "runId": "20260702235645-59bf1e",
+        "checks": 10,
+        "eventId": "21d09f99"
+      }
+    },
+    {
+      "name": "staging_import",
+      "ok": true,
+      "reason": "ok",
+      "evidence": {
+        "source": "inter-hub-haskell",
+        "bundleSha256": "e1b53b7f2d67ef7a",
+        "dryRun": false,
+        "counts": {"created": 28, "updated": 0, "errors": 0}
+      }
+    },
+    {
+      "name": "activity_core_sink",
+      "ok": true,
+      "reason": "ok",
+      "evidence": {"posted": 1}
+    },
+    {
+      "name": "legacy_inter_hub_reference",
+      "ok": false,
+      "reason": "missing legacy Inter-Hub reference smoke evidence",
+      "evidence": {"provided": false}
+    }
+  ],
+  "notes": "Generated 2026-07-08 via Core Hub operator-cli readiness-summary. Legacy Inter-Hub gate is optional rollback evidence only."
+}