Wire repo for always-on Wiggleverse org context

Add CLAUDE.md importing ~/.claude/wiggleverse.md (planning-and-executing
init Step 5) plus repo-specific orientation for the Cline-SDK plugin.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,14 @@
+@~/.claude/wiggleverse.md
+
+# vscode-cowriting-plugin
+
+A standalone **VS Code extension** delivering the inner-loop human+machine
+coauthoring experience (from `ben.stull/rfc-app#48`) on top of **Cline's
+`@cline/sdk`** — no fork of Cline, its own coauthoring UI driving the SDK's
+programmatic agent API. Apache-2.0 SDK.
+
+- **Not** a GCP/standard-stack webapp — no flotilla/cloud infra.
+- App manifest: [`app.json`](./app.json). Content/corpus repo:
+  `benstull/vscode-cowriting-plugin-content`.
+- Tracker: Epic **#1** (the plugin), first Feature **#2** (the runnable POC
+  skeleton on `@cline/sdk`).