add chadscript/* stdlib module resolution (router, argparse, http-utils)

[cs01]

ChadScript stdlib module resolution

Summary

Adds chadscript/* module namespace for accessing built-in stdlib modules. Moves router, argparse, and http-utils from scattered source locations into a cohesive lib/ directory and implements module resolution in both JS and native compilers.

Changes

Module Reorganization

• Moved to lib/: router.ts, http-utils.ts (previously in src/)
• Symlink: lib/argparse.ts → src/argparse.ts (eliminates duplication, single source of truth)
• Imports updated: All examples and tests now use import { ... } from "chadscript/*"

Compiler Support

JS compiler (compiler.ts):

• Resolves chadscript/* imports using __libDir from import.meta.url
• Falls back to relative paths for local development

Native compiler (src/chad-native.ts + native-compiler-lib.ts):

• Calls registerStdlib() at startup to register embedded stdlib files
• Uses ChadScript.embedFile() to load lib files
• Linker embeds stdlib files into native binary via -Wl,-sectcreate

TypeScript Config

• Added tsconfig.json paths mapping for stdlib modules
• Ensures IDE autocomplete and type checking work with chadscript/* imports

Files Modified

• examples/cli-parser-demo.ts, examples/hackernews/app.ts, examples/http-server.ts, examples/string-search.ts, examples/websocket/app.ts, examples/word-count.ts
• tests/fixtures/network/router-params.ts
• lib/argparse.ts (symlink), lib/router.ts, lib/http-utils.ts
• src/compiler.ts (module resolution)
• src/native-compiler-lib.ts (stdlib registration)
• src/chad-native.ts (startup registration)
• tsconfig.json (path mappings)

Test Status

Run: npm run verify (or npm run verify:quick)

• Unit tests: ✅ All pass
• Self-hosting: ✅ Tested (native compiler can compile itself with embedded stdlib)

Benefits

• Cleaner imports: import { Router } from "chadscript/router" vs relative paths
• Discoverable: IDE autocomplete for stdlib modules
• Maintainable: Single source of truth for stdlib files (symlink + embedded in native)
• Extensible: Easy to add new stdlib modules to lib/