Added /me endpoint and made SSO login tweaks

[burgaard]

No description provided.

[Copilot]

Pull request overview

This PR updates the SDK’s OpenAPI surface (including a new /me identity endpoint) and adjusts SSO/auth behavior and documentation, alongside a URL-construction fix in the client.

Changes:

• Add /me plus new schemas to the OpenAPI spec/types, and update many endpoint auth descriptions.
• Make SSO profile resolution fall back to built-in defaults and adjust exported auth/SSO utilities.
• Fix buildURL() so baseUrl path components are preserved when constructing request URLs.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
tests/client.test.ts	Broadens the expected auth error message for “no credentials” case.
src/auth.ts	Introduces built-in SSO defaults, changes loadSsoProfile() to always return defaults, and makes the credential chain prefer SSO when config dir resolves.
src/client.ts	Updates URL construction to preserve baseUrl path prefix.
src/index.ts	Re-exports additional SSO constants and cache helper functions from auth.
openapi/seclai.openapi.json	Adds /me, new schemas, adjusts X-Account-Id description, and changes many auth description strings.
src/openapi.ts	Regenerated OpenAPI TypeScript types reflecting the updated OpenAPI JSON.
README.md	Updates SSO documentation to describe default fallback behavior and configurable SSO env vars.