diff --git a/.claude/CLAUDE.md b/.claude/CLAUDE.md
index 2b0a1d52b..06e7f3e02 100644
--- a/.claude/CLAUDE.md
+++ b/.claude/CLAUDE.md
@@ -219,7 +219,7 @@ Both are FOSS with independent governance (no Big Tech).
 ### Package Management
 
 - **Primary**: Guix (guix.scm)
-- **Fallback**: Nix (flake.nix)
+- **Nix**: retired — `flake.nix` is not accepted by Governance / Guix packaging policy; a repo with no `guix.scm` packages through a working Containerfile instead
 - **JS deps**: **Bun** (`package.json` + `bun.lock`); `bunx <tool>` to run one-off tooling
 
 ### Documentation Format
diff --git a/.machine_readable/REGISTRY.a2ml b/.machine_readable/REGISTRY.a2ml
index 008927d55..01c85cef7 100644
--- a/.machine_readable/REGISTRY.a2ml
+++ b/.machine_readable/REGISTRY.a2ml
@@ -207,7 +207,7 @@ name = "RSR — Rhodium Standard Repositories"
 stream = "governance"
 home = "rhodium-standard-repositories/"
 canonical_doc = "rhodium-standard-repositories/README.adoc"
-source_hash = "sha256:dcd870a92e82159d764a26bf6ca4f37d2cdbf9c418561dc51fc5bc2ab28279f9"
+source_hash = "sha256:8bcf1e52445efa2c7f9c83850ca98f7a92190230b76f897d8442c5a377e74c39"
 route = "the repository-compliance standard every repo is graded against"
 
 [[spec]]
diff --git a/rhodium-standard-repositories/rsr-audit.sh b/rhodium-standard-repositories/rsr-audit.sh
index c84c941e9..d0d0b1687 100755
--- a/rhodium-standard-repositories/rsr-audit.sh
+++ b/rhodium-standard-repositories/rsr-audit.sh
@@ -204,10 +204,10 @@ check_command_exists() {
 audit_category_1_infrastructure() {
     log_section "Category 1: Foundational Infrastructure"
 
-    # Nix flakes
-    check_file_exists "flake.nix" "Nix flake configuration present"
-    check_file_exists "flake.lock" "Nix flake lockfile present"
-    check_file_contains "flake.nix" "description" "flake.nix has description field"
+    # Guix (Nix is retired estate-wide)
+    check_file_exists "guix.scm" "Guix package definition present"
+    check_file_contains "guix.scm" "(name " "guix.scm declares a package name"
+    check_file_contains "guix.scm" "license" "guix.scm declares a license"
 
     # Justfile
     check_file_exists "justfile" "Justfile present"
@@ -407,9 +407,9 @@ audit_category_4_architecture() {
     # Reversibility (Git-based)
     check "Reversibility: Git repository" test -d "$REPO_PATH/.git"
 
-    # Build reproducibility (Nix)
-    if [[ -f "$REPO_PATH/flake.nix" ]]; then
-        check "Reproducible builds: Nix flakes" true
+    # Build reproducibility (Guix)
+    if [[ -f "$REPO_PATH/guix.scm" ]]; then
+        check "Reproducible builds: Guix" true
     fi
 
     # Documentation of architecture
@@ -612,9 +612,9 @@ audit_category_9_lifecycle() {
         check_file_contains "CHANGELOG.md" "\\[.*\\]" "CHANGELOG uses version brackets"
     fi
 
-    # Pinned versions (Cargo.lock, flake.lock, etc.)
+    # Pinned versions (Cargo.lock, bun.lock, etc.)
     local has_lockfile=false
-    if [[ -f "$REPO_PATH/Cargo.lock" ]] || [[ -f "$REPO_PATH/flake.lock" ]] || [[ -f "$REPO_PATH/mix.lock" ]]; then
+    if [[ -f "$REPO_PATH/Cargo.lock" ]] || [[ -f "$REPO_PATH/bun.lock" ]] || [[ -f "$REPO_PATH/mix.lock" ]]; then
         log_success "Dependency lockfile present (pinned versions)"
         PASSED_CHECKS=$((PASSED_CHECKS + 1))
         has_lockfile=true
diff --git a/rhodium-standard-repositories/ux-test-harness/run-ux-test.sh b/rhodium-standard-repositories/ux-test-harness/run-ux-test.sh
index 57e2ad9c2..3ed932f7f 100755
--- a/rhodium-standard-repositories/ux-test-harness/run-ux-test.sh
+++ b/rhodium-standard-repositories/ux-test-harness/run-ux-test.sh
@@ -138,15 +138,15 @@ MR="$REPO_DIR/.machine_readable"
 [ -f "$MR/ADJUST.contractile" ] && record "adjust_contractile" "pass" "ADJUST.contractile present" \
     || record "adjust_contractile" "warn" "ADJUST.contractile missing"
 
-# --- Phase 5: Guix/Nix environment ---
+# --- Phase 5: Guix environment (Nix is retired) ---
 echo "" >&2
 echo "Phase 5: Reproducible environment" >&2
 
 [ -f "$REPO_DIR/guix.scm" ] && record "guix" "pass" "guix.scm present" \
     || record "guix" "warn" "guix.scm missing"
 
-[ -f "$REPO_DIR/flake.nix" ] && record "nix" "pass" "flake.nix present" \
-    || record "nix" "warn" "flake.nix missing"
+[ -f "$REPO_DIR/flake.nix" ] && record "nix" "warn" "flake.nix present (Nix is retired; remove it)" \
+    || record "nix" "pass" "no flake.nix"
 
 # --- Phase 6: LLM warmup ---
 echo "" >&2