Archive V1/V2 source checkouts under archive/v2

The platform is parked pending the V3 redesign. The nine component
checkouts (mcat, mcdoc, mcdsl, mcias, mcns, mcp, mc-proxy, mcr, metacrypt)
move to archive/v2/, still as independent git repos. Documentation stays
where it is; README and CLAUDE.md gain a pointer.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.gitignore

@@ -20,3 +20,6 @@
 /mcr.toml
 /metacrypt.toml
 /.claude/
+
+# V1/V2 source checkouts, archived 2026-09-20. Each is its own git repo.
+/archive/

CLAUDE.md

@@ -2,6 +2,11 @@
 
 This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
 
+> **2026-09-20 — V1/V2 are archived.** The platform was parked and is being
+> redesigned as V3 (see `docs/v3/`). The source repos described below now live
+> under `archive/v2/` (each still its own git repo, gitignored here). Paths in
+> this document that name a component directory are relative to `archive/v2/`.
+
 ## Overview
 
 Metacircular is a multi-service personal infrastructure platform. This root repository is a workspace container — each subdirectory is a separate Git repo (gitignored here). The authoritative platform-wide standards live in `engineering-standards.md`.

README.md

@@ -15,6 +15,11 @@ All services are written in Go and follow shared
 [engineering standards](engineering-standards.md). Full platform documentation
 lives in [docs/metacircular.md](docs/metacircular.md).
 
+> **2026-09-20 — V1/V2 are archived.** The platform was parked and is being
+> redesigned as V3 (see `docs/v3/`). The source repos described below now live
+> under `archive/v2/` (each still its own git repo, gitignored here). Paths in
+> this document that name a component directory are relative to `archive/v2/`.
+
 ## Components
 
 | Component | Purpose | Status |