diff --git a/DEBT-DESIGN.md b/DEBT-DESIGN.md
index 0585ba2..67a0b96 100644
--- a/DEBT-DESIGN.md
+++ b/DEBT-DESIGN.md
@@ -479,3 +479,42 @@ The first live consequence: the deploy restart of `79d2053` was not recorded,
 and `manual_intervention` stayed in the gap list afterwards. That is the
 correct result. Orchestra can record the evidence and this history contains
 none, which is an honest gap rather than synthetic evidence.
+
+## Slice B status, 2026-08-30
+
+```text
+worker observation durability         proven live
+incident open/close semantics         proven live
+high-water, no phantom recurrence     proven live
+task attribution                      proven live
+frozen historical provenance          proven live
+
+eligibility calculation               proven against real data
+eligibility transition                unexercised
+manual intervention recording         implemented
+manual intervention provenance        unexercised
+```
+
+Neither unexercised branch will be manufactured. A second task hitting the
+same failure exercises the first, and a genuine repair exercises the second.
+
+The proof that matters from the live run:
+
+```text
+recurrence 5, intensity 10, distinct tasks 1, interventions 0  ->  eligible=false
+```
+
+A noisy failure inside one task does not become system-level maintenance debt.
+The three counts stay separate on purpose: recurrence is how often the incident
+happened, intensity is how repetitive each incident became, and breadth is how
+many independent tasks paid for it. Operational debt requires breadth unless an
+operator had to intervene.
+
+### The reasons check is part of the design, not a formality
+
+The aggregate numbers moved in a way that looked like a promotion, and reading
+them that way was wrong: the eligible count rose because of an unrelated item.
+The pure eligibility explanation contradicted that inference with counted
+facts. That is the argument for the ledger resting on mechanically derived
+evidence rather than on anyone's reading of what looks recurring, including an
+agent's.