Improve USPTO CLI API reliability and search workflows

[corlin]

What changed

• classify authentication and invalid-input failures with stable exit codes
• add the official USPTO OpenAPI reference documents
• add advanced petition search filters, pagination, field projection, and JSON/CSV exports
• resolve publication and patent identifiers for application-focused commands
• update the bundled USPTO skill guidance and README examples

Why

These changes make scripted use more reliable, expose more of the Petition API search surface, and remove the manual application-number lookup step for common application workflows.

Validation

• go test ./...
• go build ./...
• live USPTO API checks for search, application, PTAB, petitions, and bulk-data flows
• git diff --check