feat: RFC 0051 Phase 2-5 implementation
Phase 2 (MCP Tools):
- blue_dialogue_round_context - bulk fetch context for prompt building
- blue_dialogue_expert_create - create experts mid-dialogue
- blue_dialogue_round_register - bulk register perspectives, tensions, refs
- blue_dialogue_verdict_register - register interim/final/minority verdicts
- blue_dialogue_export - export dialogue to JSON with provenance
Phase 2c (Validation Layer):
- ValidationError struct with code, message, field, suggestion, context
- ValidationCollector for batch error collection
- Semantic constraints: resolve/address/reopen → Tension, refine → same-type
- validate_round_register_inputs() returns all errors before DB operations
- 8 new validation tests (20 total alignment_db tests)
Phase 5 (Skills):
- Updated alignment-play skill with DB-backed workflow
- Two-phase ID system documentation
- Cross-references alignment-expert skill for marker syntax
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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