Merge pull request #2472 from EpicenterHQ/claude/retire-layout-benchmark

Retire the scalar-facts layout benchmark ADR-0178 made moot

Author: braden-w

docs/adr/0161-each-person-has-one-epicenter-replicated-on-each-adapter-boundary.md

@@ -142,11 +142,15 @@ The proxy includes structured addresses, row fields, and value content. It
 excludes terminal row tombstones, reversible value absences, sequences, wire
 framing, SQLite pages, documents, blob digests, and raw blob bytes. The target is
 therefore representative present-state stress evidence, not a bound on total
-replica size or lifetime growth. The
-[maintained benchmark contract](../../scripts/benchmarks/scalar-facts-layout/README.md)
-owns the proxy encoding, fixture ratios, physical measurements, and outcome
-vocabulary; it reports current-fact count and current protocol-fact bytes
-separately.
+replica size or lifetime growth. The inclusion and exclusion list above is the
+proxy definition; evidence must report current-fact count and current
+protocol-fact bytes separately.
+
+**Note (2026-07-31):** the layout benchmark that formerly owned the proxy
+encoding, fixture ratios, and outcome vocabulary was deleted once ADR-0178
+settled both physical-layout axes on semantic grounds. Capacity evidence still
+needs an instrument; whoever builds it re-derives the encoding from the
+definition above rather than from the deleted harness.
 
 Browser capacity remains conditional. Physical iOS Safari and physical Android
 Chrome must complete a maintained floor of 250,000 final-present addresses and

docs/benchmarks/scalar-facts-layout/README.md

@@ -32,8 +32,12 @@ That path no longer exists. The monolith was decision-disabled and removed once
 its in-tree schema had drifted past the shape this report records; git history
 keeps it. To re-run this measurement, run the archived
 `2026-07-21-bun-native-full-schema-v3.source.ts` above, which is the exact
-source behind these numbers. The maintained instrument for new evidence is
-`scripts/benchmarks/scalar-facts-layout/`.
+source behind these numbers.
+
+There is no maintained instrument for new evidence. The layout harness that
+replaced this monolith was itself deleted on 2026-07-31, once ADR-0178 settled
+both physical-layout axes on semantic grounds and made the four-candidate
+comparison moot. These artifacts remain as history only.
 
 Environment: