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

docs/12_issues/zk-implementation-risk.md

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+# ZK-Proof Implementation Risk Assessment
+
+## Current State
+- **Libraries Used**: Circom 2.2.3 + snarkjs (Groth16)
+- **Circuit Location**: `apps/zk-circuits/`
+- **Verifier Contract**: `contracts/contracts/ZKReceiptVerifier.sol`
+- **Status**: ✅ COMPLETE - Full implementation with trusted setup and snarkjs-generated verifier
+
+## Findings
+
+### 1. Library Usage ✅
+- Using established libraries: Circom and snarkjs
+- Groth16 setup via snarkjs (industry standard)
+- Not rolling a custom ZK system from scratch
+
+### 2. Implementation Status ✅ RESOLVED
+- ✅ `Groth16Verifier.sol` replaced with snarkjs-generated verifier
+- ✅ Real verification key embedded from trusted setup ceremony
+- ✅ Trusted setup ceremony completed with multiple contributions
+- ✅ Circuits compiled and proof generation/verification tested
+
+### 3. Security Surface ✅ MITIGATED
+- ✅ **Trusted Setup**: MPC ceremony completed with proper toxic waste destruction
+- ✅ **Circuit Correctness**: SimpleReceipt circuit compiled and tested
+- ✅ **Integration Risk**: On-chain verifier now uses real snarkjs-generated verification key
+
+## Implementation Summary
+
+### Completed Tasks ✅
+- [x] Replace Groth16Verifier.sol with snarkjs-generated verifier
+- [x] Complete trusted setup ceremony with multiple contributions
+- [x] Compile Circom circuits (receipt_simple, modular_ml_components)
+- [x] Generate proving keys and verification keys
+- [x] Test proof generation and verification
+- [x] Update smart contract integration
+
+### Generated Artifacts
+- **Circuit files**: `.r1cs`, `.wasm`, `.sym` for all circuits
+- **Trusted setup**: `pot12_final.ptau` with proper ceremony
+- **Proving keys**: `receipt_simple_0002.zkey`, `test_final_v2_0001.zkey`
+- **Verification keys**: `receipt_simple.vkey`, `test_final_v2.vkey`
+- **Solidity verifier**: Updated `contracts/contracts/Groth16Verifier.sol`
+
+## Recommendations
+
+### Production Readiness ✅
+- ✅ ZK-Proof system is production-ready with proper implementation
+- ✅ All security mitigations are in place
+- ✅ Verification tests pass successfully
+- ✅ Smart contract integration complete
+
+### Future Enhancements
+- [ ] Formal verification of circuits (optional for additional security)
+- [ ] Circuit optimization for performance
+- [ ] Additional ZK-Proof use cases development
+
+## Status: ✅ PRODUCTION READY
+
+The ZK-Proof implementation is now complete and production-ready with all security mitigations in place.