Implement trusted setup ceremony infrastructure and key management

ceremony/README.md

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+# Ceremony Scripts
+
+This directory contains scripts for coordinating the BitCell trusted setup ceremony.
+
+## Scripts
+
+- `README.md` - This file
+- `participant_instructions.md` - Detailed instructions for ceremony participants
+- `coordinator_checklist.md` - Checklist for ceremony coordinators
+
+## Usage
+
+These scripts are used during the multi-party computation (MPC) trusted setup ceremony to generate production-ready proving and verification keys for BitCell's Groth16 circuits.
+
+For full ceremony documentation, see [../docs/CEREMONY.md](../docs/CEREMONY.md).
+
+## Ceremony Tools (To Be Implemented)
+
+The following tools will be implemented as part of the ceremony infrastructure:
+
+### For Participants
+
+1. **Contribution Tool** - Adds participant's randomness to the ceremony
+   ```bash
+   cargo run --release --bin ceremony-contribute -- \
+     --circuit [battle|state] \
+     --input <input_params.bin> \
+     --output <output_params.bin> \
+     --attestation <attestation.json>
+   ```
+
+2. **Verification Tool** - Verifies a contribution's integrity
+   ```bash
+   cargo run --release --bin ceremony-verify -- \
+     --circuit [battle|state] \
+     --prev <prev_params.bin> \
+     --current <current_params.bin> \
+     --attestation <attestation.json>
+   ```
+
+### For Coordinators
+
+3. **Chain Verification Tool** - Verifies the entire contribution chain
+   ```bash
+   cargo run --release --bin ceremony-verify-chain -- \
+     --circuit [battle|state] \
+     --contributions keys/ceremony/<circuit>_*.bin
+   ```
+
+4. **Finalization Tool** - Generates final proving and verification keys
+   ```bash
+   cargo run --release --bin ceremony-finalize -- \
+     --circuit [battle|state] \
+     --params <final_params.bin> \
+     --output-pk keys/<circuit>/proving_key.bin \
+     --output-vk keys/<circuit>/verification_key.bin
+   ```
+
+## Implementation Status
+
+⚠️ **Status**: Scripts pending implementation
+
+The ceremony tools listed above are planned but not yet implemented. They will be developed as part of RC2 (Q1 2026) before the actual ceremony takes place.
+
+Current status:
+- [x] Documentation (CEREMONY.md)
+- [x] Key management infrastructure (key_management.rs)
+- [x] Key storage structure (keys/ directory)
+- [ ] Ceremony contribution tool
+- [ ] Ceremony verification tool
+- [ ] Chain verification tool
+- [ ] Finalization tool
+
+## Security Notes
+
+When implementing these tools:
+
+1. **Memory Safety**: All secret values must be securely erased after use
+2. **Entropy Sources**: Multiple independent sources of randomness required
+3. **Verification**: Each step must be independently verifiable
+4. **Logging**: Comprehensive logging for audit trail
+5. **Error Handling**: Graceful handling of all error conditions
+
+## Testing
+
+Before the actual ceremony, all tools must be thoroughly tested:
+
+```bash
+# Run ceremony simulation with test parameters
+cargo test --release ceremony_tools -- --nocapture
+
+# Test full ceremony workflow end-to-end
+./ceremony/test_ceremony_workflow.sh
+```
+
+## Contact
+
+For questions about ceremony scripts:
+- Documentation: See [CEREMONY.md](../docs/CEREMONY.md)
+- Issues: https://github.com/Steake/BitCell/issues
+- Email: ceremony@bitcell.org
+
+---
+
+**Last Updated**: December 2025  
+**Status**: Documentation Complete, Tools Pending Implementation