OpenSSL 3.x ignores intermediate CA certs in -CAfile (verify code 20)
but correctly builds chains with -CApath (verify code 0).
All three clients now use capath:
- service.py: ssl.create_default_context(capath=...)
- _llm_http.py: verify='/etc/ssl/certs/'
- preview_llm_client.py: verify='/etc/ssl/certs/'
check_llm_certs.py rewritten for clarity.
Tests all 4 SSL methods with actual project libraries:
- httpx (verify=True/False/SSLContext cafile/cafile+capath)
- requests (verify=True/False/cafile/capath)
- openssl s_client (default/CAfile/CApath/chain bundle)
- certutil (NSS/Chromium)
- certifi vs system CA comparison
Outputs JSON summary with AI diagnosis hint.