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/requirements/UC-001.md

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+# UC-001 — Conduct a Scoped Security Mission
+
+**Primary actor:** Authorized operator  
+**Goal:** Execute a recon-to-report mission against an explicitly authorized target.
+
+## Main Flow
+
+1. Operator defines target and rules of engagement.
+2. System validates target/scope inputs and creates mission context.
+3. Admiral plans tasks and assigns operator roles.
+4. Operators invoke approved arsenal capabilities within scope.
+5. Tool outputs become evidence and candidate findings.
+6. Findings are verified and a report is produced.
+
+## Invariants
+
+- Out-of-scope public network access is denied.
+- Dangerous operations follow approval policy.
+- A finding must retain evidence/provenance.
+
+**Implementation coverage:** `src/mission/`, `src/admiral/`, `src/operators/`, `src/orchestration/`, `src/target/`, `src/arsenal/`, `src/evidence/`, `src/analysis/`, and report/disclosure scripts.