docs: architecture — add v3.8.0 Server Implementation milestone plan section #8014

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HAL9000 wants to merge 1 commits from spec/architecture-v380-milestone-plan into master

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CleverAgents Agent 6142c47ed3 docs(spec): add v3.8.0 Server Implementation milestone plan section
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The spec's Milestone Plan section ended at v3.7.0. The server architecture
is fully documented (ADR-047, ADR-048, Server and Client Architecture section)
but the milestone delivery format — deliverables table, architectural
constraints, and definition of done — was absent.

This commit adds the `### v3.8.0 — Server Implementation` section following
the same structure as v3.2.0–v3.7.0, covering:
- 20 verifiable deliverables (A2A endpoint, extension methods, transports,
  LangGraph Platform RemoteGraph, PostgreSQL, auth/authz, Docker/Helm)
- Key architectural constraints (A2A exclusivity, layer sharing, PostgreSQL
  only, RemoteGraph actors, namespace isolation, HTTPS required)
- Definition of done (end-to-end server test, Docker/Helm deployment,
  security integration tests)

Also updates the milestone plan header to reflect v3.8.0 coverage and
refreshes the milestone status snapshot to 2026-04-12 counts.
2026-04-12 19:35:20 +00:00