docs: Add proper openspec configuration for MVP
Created comprehensive openspec structure:
openspec/specs/:
- mvp.md: MVP feature overview
- architecture.md: System architecture and data flows
openspec/changes/add-pqc-voting-mvp/:
- proposal.md: Project proposal with scope and rationale
- tasks.md: Detailed implementation tasks (6 phases, 30+ tasks)
- design.md: Complete design document
- Cryptographic algorithms (Paillier, Kyber, Dilithium, ZKP)
- Data structures (Block, Blockchain, Ballot)
- API endpoint specifications
- Security properties matrix
- Threat model and mitigations
Follows openspec three-stage workflow:
1. Creating changes (proposal-based)
2. Implementation (tracked via tasks)
3. Completion (with validation)
Ready for implementation phase with clear requirements.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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