v0.2.0-rc.1: design doc + version bump + better-sqlite3 dep

Major iteration: self-learning agent with knowledge base, post-mortem
coach, and persona narration. See docs/v0.2.0-self-learning.md for the
full design. This commit only adds the scaffolding (design + deps);
subsequent commits add the modules.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pepa-pi-bot",
-  "version": "0.1.0",
+  "version": "0.2.0-rc.1",
   "private": true,
   "description": "An autonomous, self-extending Minecraft player powered by Pi and Mineflayer.",
   "license": "MIT",
@@ -31,6 +31,7 @@
     "mineflayer-pathfinder": "^2.4.5",
     "mineflayer-pvp": "^1.3.2",
     "mineflayer-tool": "^1.2.0",
+    "better-sqlite3": "^11.3.0",
     "prismarine-item": "^1.18.0",
     "prismarine-viewer": "^1.33.0",
     "react": "^19.2.6",