v0.2.0 — USDT verified live on TRON, clients on PyPI and npm, docs site, worked example

[OliverD25]

v0.2.0 is out. Since v0.1.1, the project grew from "a service you can deploy" toward "a project you can adopt":

• The USDT path is no longer fake-tested only. A live session on TRON Nile ran a real deposit, a real withdrawal verified against TronGrid and confirmed 39 blocks deep, and a duplicate-transaction attempt that was correctly refused. Transaction ids and everything the session captured: the verification log. The recorded payloads are committed, so our TronGrid fake can never silently drift again.
• Client libraries: crypto-processing-client on PyPI and @oliverd25/crypto-processing-client on npm — generated cores locked to the committed OpenAPI document, handwritten webhook verification and idempotency handling.
• A second asset added through the extension contract: Lightning (BTC_LN, off by default), which passed the published conformance suite unmodified — that was the acceptance test the contract was written for.
• A docs site — https://oliverd25.github.io/crypto-processing-api/ — and a worked example platform (examples/platform-demo/) that re-proves itself in the nightly end-to-end run.

Upgrading from v0.1.x: pull the image, alembic upgrade head, restart. Nothing on the wire changes; details in the changelog.

Known honest edges are unchanged and documented: USDT withdrawals are operator-sent, deposits attribute heuristically over a shared address pool, and there has been no external audit.