Add first-party Think instrumentation

[RulaKhaled]

Cloudflare Think (@cloudflare/think) — opinionated Workers agent harness.

First-party Orchestrion / Node auto-instrumentation. Zero-config. Target: v11. Approach TBD after investigation.

Related: #22325, TET-2715.

**Refs: **@cloudflare/think · Project Think

[linear-code]

JS-3568