fix: restore broken CLI package

[fabiovincenzi]

Fixes #1498

• Fix TypeScript build configuration for the CLI workspace
• Update stale imports and missing package exports that drifted from the main codebase
• Align CLI error handling with current server API responses (403, 400, reject reason, attestation)
• Fix test setup to load the correct configuration

[netlify]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.66%. Comparing base (c0b4a8d) to head (1b3e695).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1499   +/-   ##
=======================================
  Coverage   89.66%   89.66%           
=======================================
  Files          68       68           
  Lines        4869     4869           
  Branches      888      888           
=======================================
  Hits         4366     4366           
  Misses        485      485           
  Partials       18       18           

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[jescalada]

LGTM! How did you notice the failing imports and API usage mismatch here? Just want to make sure that there aren't any other similar issues before the v2 release. Related: #1484

We might need extra tests to cover CLI and plugin usage via imports to prevent them from failing on API/version changes.

[fabiovincenzi]

@jescalada I found these by trying to build and run the CLI tests locally, and they all failed. The issues accumulated over time as the backend evolved (modules moved, exports changed, new API validations added) without updating the CLI, which wasn't being tested in CI, so we lost those bugs.
With #1500 CLI tests will run in CI, any future API/export changes that break the CLI will be caught immediately.

[jescalada]

Sounds good! Will go ahead and merge this if there aren't any other pending issues.