feat: @agor/stores package + Electrobun hardening (WIP)

- packages/stores/: theme, notifications, health stores extracted
- Electrobun hardening: durable event sequencing, file conflict detection,
  push-based updates, backpressure guards (partial, agents still running)

packages/stores/tsconfig.json

@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "strict": true,
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "verbatimModuleSyntax": true,
+    "paths": {
+      "@agor/types": ["../types/index.ts"],
+      "@agor/types/*": ["../types/*.ts"]
+    }
+  },
+  "include": ["*.ts"],
+  "references": [
+    { "path": "../types" }
+  ]
+}