diff --git a/AFI_Full_Architecture.md b/AFI_Full_Architecture.md
index c55f9d8..84d6ef6 100644
--- a/AFI_Full_Architecture.md
+++ b/AFI_Full_Architecture.md
@@ -147,7 +147,7 @@ Analysts may configure and run conforming UWR profiles, decay surfaces, and stra
 - It implements templates (which parameterize values, never topology), plugin/component and official-composition discovery, analyst-strategy configuration, the governed composition model (plugin-subset selection, repeated same-category nodes, sequential/concurrent ordering via explicit dependencies, bounded declarative conditional branches, deterministic multi-parent joins), **canonical hashing** (`canonical-json-hashing.v1` with domain-tagged manifest/analyst-config/plugin-set hashes, KAT-pinned), and fail-closed artifact packaging.
 - It consumes byte-pinned copies of the afi-config schema closure; nothing it emits is canonical until validated against those contracts. Its suite is 207 tests.
 
-Factory is **not** the API Atlas, **not** the Gateway, **not** the Reactor runtime, **not** a District pipehead, and **not** the source of scoring law or finality. It is a library and CLI that produces artifacts; it is **not deployed** as a service.
+Factory is **not** the API Atlas, **not** the Gateway, **not** the Reactor runtime, and **not** the source of scoring law or finality. It is a library and CLI that produces artifacts; it is **not deployed** as a service.
 
 ### 4. Gateway ingress plane **(Implemented)**
 
diff --git a/ARCHITECTURE_STATUS.md b/ARCHITECTURE_STATUS.md
index 319c34f..975e93a 100644
--- a/ARCHITECTURE_STATUS.md
+++ b/ARCHITECTURE_STATUS.md
@@ -87,4 +87,3 @@ Implementation lives under:
 | Composition reference | The thin `afi.composition-ref.v1` object carried on `afi.scored-signal-evidence.v3`, binding evidence to the executed composition by canonical hashes |
 | District 1 — Signal Evaluation | The **active** Signal Evaluation capability and authority domain (`district-one-signal-evaluation-capability-v0.1`, D1CAP-GOV): canonical input → five-category enrichment → deterministic join → analyst/scorer/UWR seam → District-2 handoff. Its current implementation is the live GraphExecutor pipeline (`afi-reactor/src/pipeline/`); implementations may be replaced through accepted authority without retiring the district |
 | District 2 — Evidence & Provenance | The active canonical data & provenance boundary: receives the scored evaluation result from District 1 and owns evidence construction, validation, and the canonical persistence handoff. Live law in `afi-reactor/src/evidence/provenance/` |
-| Pipehead | The bounded stage discipline of the Pipehead Addendum (one node → one validated category result → merge → one scorer seam), implemented today by the live pipeline nodes. District 1's former non-production Pipehead POC implementation was retired and deleted by Mission A (DSC-GOV) — an implementation retirement only, not a District retirement (D1CAP-GOV); git history preserves the former implementation |
diff --git a/scripts/check_architecture_doc.py b/scripts/check_architecture_doc.py
index 95a7964..f58fa6d 100644
--- a/scripts/check_architecture_doc.py
+++ b/scripts/check_architecture_doc.py
@@ -70,6 +70,13 @@
     "src/pipeheads",
 ]
 
+# Retired terminology that must not appear as current architecture in this
+# present-tense map (Mission R0 forward-only closure). Matched case-insensitively
+# as a substring. The Pipehead POC is retired; git history is the archive.
+BANNED_TERMS = [
+    "pipehead",
+]
+
 
 def main() -> int:
     here = os.path.dirname(os.path.abspath(__file__))
@@ -112,6 +119,11 @@ def main() -> int:
             line = low.count("\n", 0, m.start()) + 1
             failures.append(f"banned path named: {banned_path!r} (line {line})")
 
+    for term in BANNED_TERMS:
+        for m in re.finditer(re.escape(term), low):
+            line = low.count("\n", 0, m.start()) + 1
+            failures.append(f"retired terminology named as current: {term!r} (line {line})")
+
     print()
     if failures:
         print(f"RESULT: FAIL ({len(failures)} problem(s) in {DOC})")
diff --git a/scripts/check_atlas_summary.py b/scripts/check_atlas_summary.py
index dbb6980..a938a4e 100644
--- a/scripts/check_atlas_summary.py
+++ b/scripts/check_atlas_summary.py
@@ -14,7 +14,7 @@
     (active Districts, capabilities, structures, interfaces, typed routes,
     participant roles);
   * every participant-role display name appears;
-  * the five governed enrichment categories are named exactly and 'social' is not;
+  * the five governed enrichment categories are named exactly;
   * the current operation identifier factory.official.list is named (residue
     policing of the retired operation name is left to check_stale_refs.py);
   * the registry contract id afi.protocol-atlas.v1 is referenced.