The previous adapter targeted an endpoint shape RAGcore never actually
exposed. health() now checks /health/ready and ask() posts to the real
POST /v1/answers with Bearer auth and requested_space_ids, matching
RAGcore's actual contract after this session's Bearer-auth and
search/answer wiring work.
Adds RAGCORE_SPACE_ID config/env plumbing (a question is meaningless
without a knowledge space to scope it to) and 12 new adapter tests
covering degradation paths: missing space id, connection errors,
non-200 responses, malformed responses, not-answerable, and
answerable-without-citations all fail closed to "insufficient
evidence" rather than fabricating an answer.
KNOWLEDGE_PROVIDER stays "demo" in production for now -- switching
requires RAGcore's own search/answer application to actually be
deployed and live-verified, tracked separately in PROJECT_STATE.md.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
