diff --git a/.dockerignore b/.dockerignore
index d682daf49..0ffef0451 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -8,10 +8,15 @@ playwright-report/
 coverage/
 .nyc_output/
 
-# Retired backend source/test roots must not enter the Rust-only source image.
+# Retired Node backend roots must not enter the Rust-only source image.
 /server/
 /test/server/
 /test/unit/server/
+# /test/integration/server/ is NOT retired (live managed-provider parity
+# suites) but stays OUT of the Cloud Run image deliberately: its tests build
+# and spawn the real Rust server and need a Docker daemon (workload image),
+# neither of which exists in the cloud container. They are covered by LOCAL
+# lanes: the default vitest config (test:unit / base gate / pre-push).
 /test/integration/server/
 
 # Version control and CI
diff --git a/Cargo.lock b/Cargo.lock
index 987056878..150ee391b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1422,6 +1422,7 @@ dependencies = [
 name = "freshell-runtime-protocol"
 version = "0.1.0"
 dependencies = [
+ "freshell-platform",
  "hmac",
  "serde",
  "serde_json",
diff --git a/crates/freshell-runtime-protocol/Cargo.toml b/crates/freshell-runtime-protocol/Cargo.toml
index 0d6952761..d4a8298ab 100644
--- a/crates/freshell-runtime-protocol/Cargo.toml
+++ b/crates/freshell-runtime-protocol/Cargo.toml
@@ -13,3 +13,8 @@ uuid = { version = "1", features = ["v4"] }
 sha2 = "0.10"
 hmac = "0.12"
 thiserror = "2"
+
+[dev-dependencies]
+# Dev-only: the drift guard test asserts that the recipes built by
+# freshell-platform are the ones this crate's approved digest list accepts.
+freshell-platform = { path = "../freshell-platform" }
diff --git a/crates/freshell-runtime-protocol/src/lib.rs b/crates/freshell-runtime-protocol/src/lib.rs
index 445c5019e..0cd33a132 100644
--- a/crates/freshell-runtime-protocol/src/lib.rs
+++ b/crates/freshell-runtime-protocol/src/lib.rs
@@ -1977,6 +1977,23 @@ impl TerminalLaunchSpec {
     }
 }
 
+/// Approved SHA-256 digests of the managed Claude `--settings` recipe
+/// (`freshell_platform::cli_launch::claude_settings_json`). The recipe is
+/// pinned by digest (not raw text) so the list stays a fixed-size constant.
+/// Superseded recipe revisions stay listed so durable argv persisted under
+/// them keeps validating. When `freshell-platform` changes the recipe, add
+/// the new digest here — the drift-guard test
+/// (`approved_claude_settings_digests_track_current_recipes`) fails with the
+/// computed digest until you do.
+const APPROVED_CLAUDE_SETTINGS_DIGESTS: [&str; 4] = [
+    // Current recipes (since 0908a4624, Oct 4 2026: bell via hook response).
+    "41b86fd2aed9fa85ad0c3e99695de49fdadc36fcd6dc80d9fb53a2305b95cd71", // Unix
+    "b48c5d93ff2129438e2e10dc9eadc45849ec1b93c683a1ca08aebaa55d46a786", // Windows
+    // Superseded recipes (pre-0908a4624: bell via /dev/tty and CONOUT$).
+    "aa8900bab7bd9bcbb64634d60593a9217c1639b539cea23318122b3428d123c6", // Unix
+    "d2dcb96c036160b2469bcd732fdc8d767dd481f9c0c864ce47d58ed057652c4d", // Windows
+];
+
 /// Durable argv accepts only provider launch selectors. Credential-bearing
 /// switches must be resolved through the child-only OneCLI path instead.
 pub fn validate_managed_terminal_args(mode: &str, args: &[String]) -> Result<(), RuntimeError> {
@@ -2017,11 +2034,7 @@ pub fn validate_managed_terminal_args(mode: &str, args: &[String]) -> Result<(),
         let allowed = match (mode, flag) {
             ("claude", "--settings") => {
                 let digest = format!("{:x}", sha2::Sha256::digest(value.as_bytes()));
-                matches!(
-                    digest.as_str(),
-                    "aa8900bab7bd9bcbb64634d60593a9217c1639b539cea23318122b3428d123c6"
-                        | "d2dcb96c036160b2469bcd732fdc8d767dd481f9c0c864ce47d58ed057652c4d"
-                )
+                APPROVED_CLAUDE_SETTINGS_DIGESTS.contains(&digest.as_str())
             }
             ("claude", "--mcp-config") => matches!(
                 value.as_str(),
@@ -3046,6 +3059,34 @@ where
 mod tests {
     use super::*;
 
+    /// The managed Claude `--settings` payload is BUILT by freshell-platform
+    /// (`cli_launch::claude_settings_json`) but APPROVED by digest in this
+    /// crate. The two once drifted (0908a4624 rewrote the bell commands
+    /// without updating the approved digests) and every managed Claude launch
+    /// was rejected for 10 days. This guard pins the crates together: if the
+    /// recipe changes without the digest list, rust-gate fails HERE.
+    #[test]
+    fn approved_claude_settings_digests_track_current_recipes() {
+        let mut drift = Vec::new();
+        for target in [
+            freshell_platform::cli_launch::ProviderTarget::Unix,
+            freshell_platform::cli_launch::ProviderTarget::Windows,
+        ] {
+            let recipe = freshell_platform::cli_launch::claude_settings_json(target);
+            let digest = format!("{:x}", sha2::Sha256::digest(recipe.as_bytes()));
+            let args = vec!["--settings".to_string(), recipe];
+            if validate_managed_terminal_args("claude", &args).is_err() {
+                drift.push(format!("{target:?}: {digest}"));
+            }
+        }
+        assert!(
+            drift.is_empty(),
+            "claude --settings recipe digests not in the approved list: \
+             {drift:#?}; update APPROVED_CLAUDE_SETTINGS_DIGESTS in this \
+             crate to match freshell-platform's current recipe"
+        );
+    }
+
     #[test]
     fn durable_terminal_argument_recipe_preserves_provider_options_and_legacy_modes() {
         for (provider, args) in [
diff --git a/test/unit/architecture/fresh-agent-only-runtime.test.ts b/test/unit/architecture/fresh-agent-only-runtime.test.ts
index 83772f4bf..f6e2fd6b4 100644
--- a/test/unit/architecture/fresh-agent-only-runtime.test.ts
+++ b/test/unit/architecture/fresh-agent-only-runtime.test.ts
@@ -13,7 +13,12 @@ const retiredNodeBackendPaths = [
   'server',
   'test/server',
   'test/unit/server',
-  'test/integration/server',
+  // NOTE: 'test/integration/server' was retired with the Node backend, then
+  // RE-ADDED (2026-09-28) as the live managed-provider parity suites — it is
+  // a production test root now, NOT retired, and must NOT return to this
+  // list. Its suites need a locally built Rust server binary + Docker, so
+  // they run in local lanes (default vitest config, base gate) and are
+  // deliberately excluded from the Cloud Run image (.dockerignore).
   'test/integration/session-repair.test.ts',
   'tsconfig.server.json',
   'dist/server',