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/foundation/random/README.md

@@ -0,0 +1,15 @@
+# `random`
+
+Pseudo-random generators, noise functions, and deterministic sequences.
+
+<!-- begin:auto-docs -->
+## Packages in `random`
+
+3 packages.
+
+| Package | Description |
+|---|---|
+| [`@suaveplan/noise`](./noise/README.md) | Seeded spatial noise fields for procedural content generation. Provides six field types — Perlin, Simplex (2D/3D/4D), Value, Worley/cellular (F1/F2/F2-F1 modes… |
+| [`@suaveplan/pseudo-random`](./pseudo-random/README.md) | Deterministic, seeded pseudo-random number generators (PRNGs) conforming to the `Rng` interface from `@suaveplan/types`. Ships four algorithms — Mulberry32, SF… |
+| [`@suaveplan/random`](./random/README.md) | High-level cryptographically secure randomness for application use. This is the everyday random package — it wraps the CSPRNG with ergonomic helpers for every… |
+<!-- end:auto-docs -->