feat: add npx/bunx binary distribution support

Adds infrastructure for distributing Hapi via npm as a scoped package
(@twsxtd/hapi) with platform-specific optional dependencies. This enables
installation via `npx @twsxtd/hapi` or `bunx @twsxtd/hapi`.

- Add bin/hapi.js wrapper script for platform detection and binary selection
- Create npm/ directory structure for platform-specific packages (darwin-{arm64,x64},
  linux-{arm64,x64}, win32-x64)
- Add scripts/prepare-npm-packages.ts to generate platform-specific package.json files
  and copy binaries to npm packages
- Add scripts/publish-npm.ts for automated publishing of platform packages
- Update package.json with new scoped name, bin entry, optionalDependencies, and
  prepack/publish scripts
- Update .gitignore to ignore generated npm packages and build outputs
- Update .npmignore to only include bin/hapi.js wrapper, excluding source and build files

cli/.npmignore

@@ -1,6 +1,26 @@
-# Exclude unpacked binaries from npm package
-tools/unpacked/
+# npm package only needs bin/hapi.js (defined in package.json "files" field)
+# This file is kept for documentation purposes
 
-# Keep these for npm package
-# tools/archives/
-# tools/licenses/
+# Source code (not needed - binary distribution)
+src/
+scripts/
+tools/
+demo-project/
+
+# Build outputs
+dist-exe/
+npm/
+
+# Config files
+*.md
+!README.md
+.github/
+.release-it.*
+bunfig.toml
+tsconfig.json
+.env*
+
+# Test files
+**/*.test.ts
+**/__fixtures__/
+**/__tests__/