docs(confidence-engine): checkpoint design evolution archive tranche six

docs/archive/experiments/vol-1-chapters/README.md

@@ -154,9 +154,37 @@ Experiments 54A–54K — complete provenance audit chain including graph proven
 Fidelity:
 Exact contiguous copy.
 
-Tranches 1 through 5 have now been extracted.
+Tranches 1 through 6 have now been extracted.
 The original monolithic log remains intact and authoritative while extraction is incomplete.
 
+## Tranche 6
+
+### Chapter 11
+Path:
+docs/archive/experiments/vol-1-chapters/ch11/experiments-54l-to-54q-grounding-and-evidence-stability.md
+
+Original source:
+docs/design-evolution-log.md lines 6425–7824
+
+Contents:
+Experiments 54L–54Q — semantic grounding stability under repetition, disagreement exposure between interpretations, disagreement-driven information need changes, evidence-need discrimination for same-goal scenarios, explicit evidence needs recovering higher-level consequences, and structured semantic steps preserving evidence distinction with consequence.
+
+Fidelity:
+Exact contiguous copy.
+
+### Chapter 12
+Path:
+docs/archive/experiments/vol-1-chapters/ch12/experiment-54r-clarification-requires-source.md
+
+Original source:
+docs/design-evolution-log.md lines 7825–8012
+
+Contents:
+Experiment 54R — testing whether models correctly distinguish disagreements resolvable through evidence from those requiring user input, across competing causal hypotheses, ambiguous user priority, and absent material disagreement patterns.
+
+Fidelity:
+Exact contiguous copy.
+
 ## Refactor status
 
 Only tranches 1 and 2 have been extracted.