docs(architecture): baseline current design (#109)

Capture the brownfield architecture and its relationship to the project vision.\n\n- add the current-state SAD and five retrospective ADRs\n- classify vision vectors against implementation evidence\n- record requirements, risks, gates, and construction handoff

.aiwg/architecture/adr-001.md

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+# ADR-001 — Retain a Local-First Modular Monolith
+
+**Status:** Accepted (retrospective)  
+**Date:** 2026-07-20
+
+## Context
+
+T3MP3ST ships CLI, library, localhost HTTP/War Room, MCP, orchestration, tools, evidence, and benchmarks in one Node/TypeScript package. Operators value low-friction self-hosting and local control.
+
+## Decision
+
+Treat the current architecture as a modular monolith with adapter boundaries. Do not describe it as microservices. Keep the default HTTP surface loopback-only and local artifacts operator-controlled.
+
+## Consequences
+
+Installation and typed reuse remain simple. Module boundaries require review/tests rather than process isolation. Hosted multi-tenancy or distributed workers require a new decision and architecture baseline.