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/gaming/README.md

@@ -0,0 +1,19 @@
+# `gaming`
+
+Game engines, entity-component systems, and simulation libraries.
+
+<!-- begin:auto-docs -->
+## Subcategories
+
+1 subcategory, 3 packages.
+
+### `games`
+
+Game controllers, entity-component systems, and game-server logic.
+
+| Package | Description |
+|---|---|
+| [`@suaveplan/controller`](./controller/README.md) | Universal input controller foundation. Ships the unified `ControllerInput` shape (37 normalised fields in `[0, 255]`), `BaseController` abstract base with inje… |
+| [`@suaveplan/ecs`](./ecs/README.md) | Archetype-based Entity Component System with `Uint32`-backed bitset queries, phase-ordered system scheduling, entity-ID recycling, Zod-validated component sche… |
+| [`@suaveplan/game-server`](./game-server/README.md) | Universal game-server framework. Migrated from `@suaveplan/game-server` on the reference branch `claude/review-game-engine-arch-Kaykr` (main repo `packages/uni… |
+<!-- end:auto-docs -->