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/team/team-profile.md

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+# Team Profile for Architecture Stewardship
+
+## Observed Context
+
+The last-year Git history contains more than ten author identities, including likely aliases and agent identities, so exact active human staffing is unknown. The project accepts external contributions and uses GitHub Actions on pull requests and `main`.
+
+## Required Responsibilities
+
+- **Architecture steward:** Owns SAD, ADR lifecycle, and vision alignment.
+- **Safety reviewer:** Reviews scope, credentials, approvals, and dangerous tools.
+- **Evaluation steward:** Owns benchmark validity, provenance, and claim wording.
+- **Release integrator:** Confirms CI, docs, package metadata, and release evidence.
+- **Domain contributor:** Supplies implementation and tests for a specific target/tool domain.
+
+Roles may be held by the same person. A change crossing a trust boundary should receive both architecture and safety review; a capability/maturity claim should receive evaluation review.