Create docs/blobbi/blobbi-tag-schema.md as the canonical source of truth
for Blobbi tag definitions. The runtime schema at blobbi-tag-schema.ts
MUST align with this spec.
Includes:
- All 35 canonical tags organized into 11 categories
- Required vs optional designation
- Persistence rules across stage transitions
- Stage transition rules (hatch, evolve)
- Migration rules
- Validation rules
- 8 deprecated tags with migration guidance
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