Fork @sinclair/typemap to @alkdev/typemap with @alkdev/typebox backend

- Rename package to @alkdev/typemap, update peerDeps to @alkdev/typebox
- Replace all @sinclair/typebox imports with @alkdev/typebox
- Replace @sinclair/hammer build system with standalone build.mjs
- Remove upstream-only files (.github, .vscode, design/, typemap.png)
- Update readme with fork notice and new package names
- Add fork copyright to license

test/options.ts

@@ -1,5 +1,5 @@
 import { Assert } from './assert'
-import { TypeBox, Valibot, Zod } from '@sinclair/typemap'
+import { TypeBox, Valibot, Zod } from '@alkdev/typemap'
 
 describe('SyntaxOptions', () => {
   it('Should map Options (Zod)', () => {