Remove unnecessary npm dependencies (pino, stream-chain, needle, is-number, ulidx)

## Request

Several dependencies are used minimally and can be eliminated:

- **pino** — replace with `fs.appendFileSync` for log writes
- **stream-chain** — assess if used; remove if replaceable
- **needle** — replace with native `fetch`
- **is-number** — trivial, inline
- **ulidx** — switch to native UUIDs

Removing these reduces install footprint and supply-chain surface area.

🤖 Filed by Claude on behalf of Kris.