diff --git a/docs/LEGACY-INGEST.md b/docs/LEGACY-INGEST.md
index 33d97ba..778e17c 100644
--- a/docs/LEGACY-INGEST.md
+++ b/docs/LEGACY-INGEST.md
@@ -59,3 +59,17 @@ intention is identified and compared against the current Svrnty Vision route.
 - Decision: keep only configuration shape and boundary docs.
 - Closure gate: provider calls, Spark/ComfyUI/vLLM calls, credential reads, or
   Docker/server startup are outside cleanup authority.
+
+### Generated Cache Custody
+
+- Source refs:
+  `/home/svrnty/workspaces/cortex-os-retired/2026-06-18/svrnty-vision-python-cache-preserved-141800/`.
+- Intention: remove interpreter-generated cache residue from the active child
+  route without deleting custody proof.
+- Current coverage: met by preserving the cache outside the umbrella and adding
+  a route-local validator guard against recurrence.
+- Decision: reject generated cache material as archive-only, not source,
+  evidence, authority, or package candidate material.
+- Closure gate: future cache recurrence fails
+  `python3 tools/validate_svrnty_vision_child.py`; no runtime, Docker, provider,
+  credential, Core, Seed, Hindsight, or sibling-route effects are implied.
diff --git a/tools/validate_svrnty_vision_child.py b/tools/validate_svrnty_vision_child.py
index 778f7a8..455892f 100755
--- a/tools/validate_svrnty_vision_child.py
+++ b/tools/validate_svrnty_vision_child.py
@@ -3,11 +3,19 @@
 from __future__ import annotations
 
 import json
+import os
 import subprocess
 import sys
 from pathlib import Path
 
 ROOT = Path(__file__).resolve().parents[1]
+sys.dont_write_bytecode = True
+
+GENERATED_ARTIFACT_DIRS = [
+    "src/svrnty_vision/__pycache__",
+    "tools/__pycache__",
+    ".pytest_cache",
+]
 REQUIRED = [
     "AGENTS.md",
     "INDEX.md",
@@ -81,6 +89,7 @@ def main() -> int:
         ],
         "CONTEXT.md": ["Visual Perception Package Candidate", "Research Handoff"],
         "docs/VISION-PACKAGE-CANDIDATE.md": ["Research reads sources; Vision sees media", "wildcard grant"],
+        "docs/LEGACY-INGEST.md": ["Generated Cache Custody", "svrnty-vision-python-cache-preserved-141800"],
         "outputs/2026-06-12-svrnty-vision-workboard-readiness-reconciliation.md": [
             "No Core promotion",
             "Seed consumption",
@@ -99,9 +108,12 @@ def main() -> int:
         if not path.exists():
             errors.append(f"missing:{rel}")
             continue
+        env = os.environ.copy()
+        env["PYTHONDONTWRITEBYTECODE"] = "1"
         completed = subprocess.run(
             [sys.executable, str(path)],
             cwd=ROOT,
+            env=env,
             text=True,
             capture_output=True,
             check=False,
@@ -109,6 +121,9 @@ def main() -> int:
         validator_outputs[rel] = completed.stdout.strip()
         if completed.returncode != 0:
             errors.append(f"validator_failed:{rel}:{completed.stderr.strip()}")
+    for rel in GENERATED_ARTIFACT_DIRS:
+        if (ROOT / rel).exists():
+            errors.append(f"generated_artifact_residue:{rel}")
     result = {
         "ok": not errors,
         "validator": "svrnty-vision-child-v1",