diff --git a/src/v3/compiler/src/pipeline_authority.rs b/src/v3/compiler/src/pipeline_authority.rs
index f0353fe0009..45a267fc9b4 100644
--- a/src/v3/compiler/src/pipeline_authority.rs
+++ b/src/v3/compiler/src/pipeline_authority.rs
@@ -1,12 +1,8 @@
-#[cfg(test)]
-use crate::dag::ArrowBody;
 use crate::dag::{Dag, DeclarationId, FieldValue, TypeConnective, ValueBody};
 
 pub(crate) const PIPELINE_AUTHORITY_FILE: &str = "src/v3/compiler/pipeline.dag";
 
 const PIPELINE_STAGE_BINDING_TYPE: &str = "PipelineStageBinding";
-#[cfg(test)]
-const PIPELINE_COMPILE_FN: &str = "compile";
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub(crate) enum PipelineSnapshotKind {
@@ -221,6 +217,10 @@ fn require_snapshot_kind(
 mod tests {
     use super::*;
 
+    use crate::dag::ArrowBody;
+
+    const PIPELINE_COMPILE_FN: &str = "compile";
+
     #[test]
     fn ordered_pipeline_stages_authority_is_pipeline_stage_binding_only() {
         let dag = Dag::new();
@@ -235,7 +235,7 @@ mod tests {
                 "lens_complexity".to_string(),
                 "emit".to_string(),
             ],
-            "ordering is structural declaration order of PipelineStageBinding rows; update this test when pipeline.dag stage set changes"
+            "ordering is structural declaration order of PipelineStageBinding rows (bootstrap pipeline.dag)"
         );
     }
 
diff --git a/src/v3/compiler/tests/integration.rs b/src/v3/compiler/tests/integration.rs
index 19b4dbbb579..d80a30f1461 100644
--- a/src/v3/compiler/tests/integration.rs
+++ b/src/v3/compiler/tests/integration.rs
@@ -37,6 +37,8 @@
 #[path = "integration/common/mod.rs"]
 mod common;
 
+#[path = "integration/bridge_lower_helpers_patch_zero_residual_test.rs"]
+mod bridge_lower_helpers_patch_zero_residual_test;
 #[path = "integration/canonical_lens_bridge_ratchet_test.rs"]
 mod canonical_lens_bridge_ratchet_test;
 #[path = "integration/cementing/cementing_lens_registry_dispatch_test.rs"]
diff --git a/src/v3/compiler/tests/integration/bridge_lower_helpers_patch_zero_residual_test.rs b/src/v3/compiler/tests/integration/bridge_lower_helpers_patch_zero_residual_test.rs
new file mode 100644
index 00000000000..3734577223e
--- /dev/null
+++ b/src/v3/compiler/tests/integration/bridge_lower_helpers_patch_zero_residual_test.rs
@@ -0,0 +1,68 @@
+//! **Layer:** integration
+//!
+//! Zero-residual receipt for **`bridge_patch_lower_helpers_residual_retired`**
+//! (T-Bridge-Retirement distributed bridge #5; see `docs/r3-structure.md` and
+//! `docs/briefs/r2-pure-bootstrap-manager.md`). PR #1014 retired the
+//! `patch_lower` + `_helpers` generated-Rust exact-string patch class; this
+//! test fails if that contiguous symbol reappears in v3-compiler Rust sources,
+//! `build.rs`, or integration/boundary/unit tests under this crate.
+
+use std::ffi::OsStr;
+use std::fs;
+use std::path::{Path, PathBuf};
+
+const SELF_BASENAME: &str = "bridge_lower_helpers_patch_zero_residual_test.rs";
+
+/// The retired bridge spells this contiguous substring; keep it out of the
+/// tree except via `concat!(...)` in this file's own needle definition.
+const FORBIDDEN: &str = concat!("patch_lower", "_helpers");
+
+fn visit_rs(root: &Path, offenders: &mut Vec<String>) {
+    let Ok(read_dir) = fs::read_dir(root) else {
+        return;
+    };
+    for entry in read_dir.flatten() {
+        let path = entry.path();
+        if path.is_dir() {
+            visit_rs(&path, offenders);
+            continue;
+        }
+        if path.extension() != Some(OsStr::new("rs")) {
+            continue;
+        }
+        if path
+            .file_name()
+            .and_then(|n| n.to_str())
+            .is_some_and(|n| n == SELF_BASENAME)
+        {
+            continue;
+        }
+        let Ok(text) = fs::read_to_string(&path) else {
+            continue;
+        };
+        if text.contains(FORBIDDEN) {
+            offenders.push(path.display().to_string());
+        }
+    }
+}
+
+#[test]
+fn lower_helpers_patch_bridge_exact_string_residual_stays_zero() {
+    let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    let mut offenders = Vec::new();
+
+    visit_rs(&manifest_dir.join("src"), &mut offenders);
+    visit_rs(&manifest_dir.join("tests"), &mut offenders);
+
+    let build_rs = manifest_dir.join("build.rs");
+    if let Ok(text) = fs::read_to_string(&build_rs) {
+        if text.contains(FORBIDDEN) {
+            offenders.push(build_rs.display().to_string());
+        }
+    }
+
+    assert!(
+        offenders.is_empty(),
+        "bridge_patch_lower_helpers_residual_retired: contiguous `{FORBIDDEN}` must not appear in v3-compiler crate Rust after PR #1014 (offenders: {offenders:?})"
+    );
+}
diff --git a/src/v3/compiler/tests/integration/sg0_census_test.rs b/src/v3/compiler/tests/integration/sg0_census_test.rs
index 39d6bd6439f..542da1242b4 100644
--- a/src/v3/compiler/tests/integration/sg0_census_test.rs
+++ b/src/v3/compiler/tests/integration/sg0_census_test.rs
@@ -307,6 +307,7 @@ const EXPECTED_HAND_AUTHORED_TEST: &[&str] = &[
     // .dag `TestClaim` form when the testgen path covers reflected-Dag
     // structural assertions over std/ types.
     "src/v3/compiler/tests/integration/method_template_contract_test.rs",
+    "src/v3/compiler/tests/integration/bridge_lower_helpers_patch_zero_residual_test.rs",
     "src/v3/compiler/tests/integration/p0_std_render_repeat_string_test.rs",
     "src/v3/compiler/tests/integration/pb1_bootstrap_full_snapshot_test.rs",
     "src/v3/compiler/tests/integration/pipe_desugar.rs",