refactor(HAI-116): rename kb to hai across all packages, CLI, and docs

- Rename npm packages from @kb/* to @hai/* and update all workspace references
- Rename CLI binary from kb to hai and config directory from .kb to .hai
- Update dashboard UI branding, titles, and references from kb to hai
- Update all test files, CI workflows, and documentation to reflect new naming
- Run comprehensive grep verification to ensure no stale kb references remain

packages/engine/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@hai/engine",
+  "name": "@kb/engine",
   "version": "0.1.0",
   "type": "module",
   "exports": {
@@ -21,7 +21,7 @@
     "test": "vitest run"
   },
   "dependencies": {
-    "@hai/core": "workspace:*",
+    "@kb/core": "workspace:*",
     "@mariozechner/pi-ai": "^0.62.0",
     "@mariozechner/pi-coding-agent": "^0.62.0"
   },