Move docs/ package mirror into document-navigator plugin

Relocate the ~6k-file docs tree from the repo root into
plugins/document-navigator/docs/ so the plugin is self-contained and
portable. docs/superpowers/ (specs and plans) stays at the repo root.

Moved via cp+rm rather than git mv because directory rename() fails with
EPERM on this WSL /mnt DrvFs mount; git rename-detection pairs the
identical-content files at commit time.

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

plugins/document-navigator/docs/ui/forms/README.md

@@ -0,0 +1,14 @@
+# `forms`
+
+Form builders, validation, and React form components.
+
+<!-- begin:auto-docs -->
+## Packages in `forms`
+
+2 packages.
+
+| Package | Description |
+|---|---|
+| [`@suaveplan/form-builder`](./form-builder/README.md) | Universal dynamic form schema engine. Renderer-agnostic — no DOM, no React, no Node-specific globals. Drives every dynamic form surface in the Suaveplan. |
+| [`@suaveplan/react-forms`](./react-forms/README.md) | React forms library for the Suaveplan ecosystem. Wraps react-hook-form + Zod with a primitives + factory + recipes architecture: every user-facing string is ty… |
+<!-- end:auto-docs -->