Set up USPTO downloader as a remote tool

Validation status (2026-08-16): boundary/parser tests and live loopback discovery passed; all three current calls reached USPTO and received HTTP 403 for an invalid validation key. No patent content was retrieved, so functional content retrieval, public publication, cross-user isolation, and extraction/load behavior remain blocked by credentials or unmeasured. Authenticated private Platform import and owner testing passed on 2026-08-16; public publication and independent-caller authorization/isolation remain untested.

Prerequisites

• Run from the ToolUniverse repository root on Linux with Python 3.12.3.
• CPU only; OCR requires bounded temporary RAM/disk.
• Keep provider data, weights, caches, and credentials outside Git.
• Bind to loopback. A non-loopback bind requires TOOLUNIVERSE_API_TOKEN; never put it in arguments or results.

Run the standard-library contract check before downloading large dependencies:

python scripts/remote_validation/setup_skill_preflight.py --implementation uspto-downloader