TypeScript conventions

Repo-wide rules:

• Strict TS; infer types where possible
• No as any — fix types or ask for help
• File/folder names: kebab-case
• Include file extensions (.ts, etc.) for relative imports
• Use node: prefix for Node imports
• Prefer named exports
• No all-caps acronyms in identifiers (e.g. makeOrpcUrl not makeORPCURL; callbackUrl, userId)
• Use pnpm for packages
• Use dedent for template strings
• Unit tests: *.test.ts next to source
• App e2e tests: apps/<app>/e2e/**