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

pnpm-lock.yaml

@@ -20,13 +20,13 @@ importers:
 
   packages/cli:
     dependencies:
-      '@hai/core':
+      '@kb/core':
         specifier: workspace:*
         version: link:../core
-      '@hai/dashboard':
+      '@kb/dashboard':
         specifier: workspace:*
         version: link:../dashboard
-      '@hai/engine':
+      '@kb/engine':
         specifier: workspace:*
         version: link:../engine
       '@mariozechner/pi-coding-agent':
@@ -60,7 +60,7 @@ importers:
 
   packages/dashboard:
     dependencies:
-      '@hai/core':
+      '@kb/core':
         specifier: workspace:*
         version: link:../core
       '@types/multer':
@@ -124,7 +124,7 @@ importers:
 
   packages/engine:
     dependencies:
-      '@hai/core':
+      '@kb/core':
         specifier: workspace:*
         version: link:../core
       '@mariozechner/pi-ai':