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-004.md

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+# ADR-004 — Derive Public Claims from Versioned Evidence
+
+**Status:** Accepted (retrospective)  
+**Date:** 2026-07-20
+
+## Context
+
+Offensive-AI performance claims are easy to overfit or report without reproducible evidence.
+
+## Decision
+
+Headline claims must be recomputed from committed corpus, ground truth, and receipts. Anti-fitting, provenance, and claim-verification gates are architectural product controls.
+
+## Consequences
+
+Repository size and CI cost increase, but claims are auditable. Raw sensitive transcripts may be withheld, so documentation must distinguish re-derivable graded verdicts from full raw reproduction.