feat: implement Anthropic native PDF support with document preservation

- Add comprehensive debug logging throughout PDF processing pipeline
- Refactor attachment processing to separate image and document handling
- Create distinct addImageURLs(), addDocuments(), and processAttachments() methods
- Fix critical bugs in stream handling and parameter passing
- Add streamToBuffer utility for proper stream-to-buffer conversion
- Remove api/agents submodule from repository

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

api/server/routes/__tests__/config.spec.js

@@ -43,7 +43,6 @@ afterEach(() => {
 
 //TODO: This works/passes locally but http request tests fail with 404 in CI. Need to figure out why.
 
-// eslint-disable-next-line jest/no-disabled-tests
 describe.skip('GET /', () => {
   it('should return 200 and the correct body', async () => {
     process.env.APP_TITLE = 'Test Title';