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-005.md

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+# ADR-005 — Separate Current State from Research Vision
+
+**Status:** Accepted  
+**Date:** 2026-07-20
+
+## Context
+
+`VISION.md` deliberately explores autonomous, distributed, cognitive, and evolutionary directions beyond the stable product. Treating it as current architecture would misrepresent capability and risk.
+
+## Decision
+
+Maintain a current-state SAD backed by code paths and a separate vision-alignment matrix. Classify each direction as implemented, partial/experimental, research, or future. Promotion requires evidence and documentation updates.
+
+## Consequences
+
+Architecture remains honest and reviewable. Maintainers must update two views when capabilities evolve, and vision alignment alone cannot justify a stable label.