chore(security): enhance environment configuration, CI workflows, and wallet daemon with security improvements

- Restructure .env.example with security-focused documentation, service-specific environment file references, and AWS Secrets Manager integration
- Update CLI tests workflow to single Python 3.13 version, add pytest-mock dependency, and consolidate test execution with coverage
- Add comprehensive security validation to package publishing workflow with manual approval gates, secret scanning, and release

apps/zk-circuits/receipt_simple_clean.circom

@@ -0,0 +1,20 @@
+pragma circom 2.0.0;
+
+include "node_modules/circomlib/circuits/bitify.circom";
+include "node_modules/circomlib/circuits/poseidon.circom";
+
+/*
+ * Simple Receipt Attestation Circuit
+ */
+
+template SimpleReceipt() {
+    signal input receiptHash;
+    signal input receipt[4];
+    component hasher = Poseidon(4);
+    for (var i = 0; i < 4; i++) {
+        hasher.inputs[i] <== receipt[i];
+    }
+    hasher.out === receiptHash;
+}
+
+component main = SimpleReceipt();