v0.2.0

Added

• JSON serialization: to_json() and from_json() for full round-trip serialization of MigrationPlan, enabling transmission over the wire, storage for audit, and presentation in UIs
• to_string(OpType) and op_type_from_string() for converting operation types to/from strings
• JsonError exception for serialization/deserialization failures
• agents-guide.md — condensed API reference for agentic coding tools (Claude Code, Cursor, Copilot, etc.)
• CLAUDE.md — project context for AI-assisted development

Fixed

• 12-step rebuild list in guide now correctly includes all 12 steps (was missing "recreate views")

Dependencies

• Vendored nlohmann/json v3.11.3 (implementation detail, not exposed in public API)