The cassette-backed test (full-flow-cassette.test.ts) covers the same
discuss→plan→detail→execute pipeline without API cost. The real-agent
test added no unique value once cassettes were committed, and the
Stage 6 npm-test validation it included was soft (warn, not fail).
Also removes the now-unused shouldRunFullFlowTests export and the
FULL_FLOW_TESTS=1 entry from CLAUDE.md.