docs(architecture,trd): v1.5 scope \u2014 Mailbox & Administrative Management Interface
- Update docs/architecture/v1.md to cover v1.5 MINOR scope
- Add trust boundaries H (Presentation) and I (Application API)
- Add component addendum (Mailbox Owner Dashboard, Ops Console, API server, RBAC middleware)
- Add v1.5 data flow diagram and idempotency notes
- Update references to umbrella #99, Architecture #114, TRD #115
- Create docs/trd/mailbox-admin-interface.md with full INTV-5 TRD
- Functional/non-functional requirements, API contracts, data model
- Story map + Mermaid dependency graph for 20 Stories (#116..#135)
- Test plan, acceptance criteria, out-of-scope declarations
Traces to: INTV-5 #109, MAJOR v1 #99, Architecture #114, TRD #115
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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