Typescript Tooling

For a new project, enable strict checking and the additional options that catch unsafe indexing, optional-property mistakes, unused code, and module inconsistencies:

```json
{
  "compilerOptions": {
    "target": "ES2022",
    "module": "NodeNext",
    "moduleResolution": "NodeNext",
    "strict": true,
    "noUncheckedIndexedAccess": true,
    "exactOptionalPropertyTypes": true,
    "noImplicitOverride": true,
    "noPropertyAccessFromIndexSignature": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "forceConsistentCasingInFileNames": true,
    "verbatimModuleSyntax": true,
    "useUnknownInCatchVariables": true,
    "noFallthroughCasesInSwitch": true,
    "esModuleInterop": true,
    "skipLibCheck": false,
    "outDir": "dist",
    "rootDir": "src"
  },
  "include": ["src/**/*.ts", "src/**/*.tsx"],
  "exclude": ["dist", "node_modules"]
}
```

Run `tsc --noEmit` in CI (or use a separate build config that emits). Keep `strict: true` for a new project; an existing codebase should migrate incrementally rather than flipping the flag atomically.