## Summary
- add the 406 feature specification for a public provider and policy-domain taxonomy surface
- include plan, research, data model, quickstart, checklist, and public route contract artifacts
- update agent context with the 406 website technology notes
## Notes
- this PR is spec and planning work only
- no runtime website implementation is included yet
## Validation
- reviewed pending git scope before commit
- verified `Agents.md` has no editor diagnostics
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #401
ahmido
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