Four-scene investor/operator-facing walkthrough proving the discourse-
planner spine is load-bearing. Each scene runs the same prompt under
flag-off (BRIEF baseline) and flag-on (RuntimeConfig.discourse_planner)
and pins a falsifiable lift assertion.
S1. EXPLAIN — Explain truth.
Flag-on: pack→teaching upgrade + 2 chain
continuation sentences over baseline.
S2. COMPOUND — What is truth, and why does it matter?
Flag-on: 9 grounded sentences across two sub-
plans; flag-off routes to OOV.
S3. WALKTHROUGH — Walk me through recall.
Flag-on emits the CLOSURE chain hop
'Recall reveals memory.'; flag-off
does not.
S4. Determinism — N=3 reruns × 3 prompts, unique(surface)=1.
Read-only against live packs + active corpus. Demo is test-gated
(7 tests, all green) and ships a stable JSON contract for downstream
consumers.
Wired into CLI as `core demo articulation [--json]` alongside the
existing trilogy (audit-tour / anti-regression / learning-loop).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
