diff --git a/crates/ecstore/src/bucket/lifecycle/bucket_lifecycle_ops.rs b/crates/ecstore/src/bucket/lifecycle/bucket_lifecycle_ops.rs
index 4332e6787..478ac34d5 100644
--- a/crates/ecstore/src/bucket/lifecycle/bucket_lifecycle_ops.rs
+++ b/crates/ecstore/src/bucket/lifecycle/bucket_lifecycle_ops.rs
@@ -819,13 +819,23 @@ impl TransitionState {
         })
     }
 
-    fn schedule_bucket_compensation(self: &Arc<Self>, bucket: &str) -> bool {
-        let mut scheduled = self.compensation_buckets.lock().unwrap();
-        if !scheduled.insert(bucket.to_string()) {
+    fn reserve_bucket_compensation(&self, bucket: &str) -> bool {
+        let inserted = match self.compensation_buckets.lock() {
+            Ok(mut scheduled) => scheduled.insert(bucket.to_string()),
+            Err(poisoned) => poisoned.into_inner().insert(bucket.to_string()),
+        };
+        if !inserted {
             return false;
         }
         Self::inc_counter(&self.compensation_scheduled_tasks);
         self.record_scanner_transition_state();
+        true
+    }
+
+    fn schedule_bucket_compensation(self: &Arc<Self>, bucket: &str) -> bool {
+        if !self.reserve_bucket_compensation(bucket) {
+            return false;
+        }
         let bucket = bucket.to_string();
         let scheduled = Arc::clone(&self.compensation_buckets);
         let state = Arc::clone(self);
@@ -3158,16 +3168,17 @@ mod tests {
         });
     }
 
-    #[tokio::test(flavor = "current_thread")]
-    async fn schedule_bucket_compensation_deduplicates_same_bucket() {
+    #[test]
+    fn reserve_bucket_compensation_deduplicates_same_bucket() {
         let state = TransitionState::new_with_capacity(1);
 
-        let first = state.schedule_bucket_compensation("bucket-a");
-        let second = state.schedule_bucket_compensation("bucket-a");
+        let first = state.reserve_bucket_compensation("bucket-a");
+        let second = state.reserve_bucket_compensation("bucket-a");
 
         assert!(first);
         assert!(!second);
         assert_eq!(state.compensation_scheduled_tasks(), 1);
+        assert_eq!(state.compensation_pending_tasks(), 1);
     }
 
     #[tokio::test(flavor = "current_thread")]
diff --git a/docs/architecture/crate-boundaries.md b/docs/architecture/crate-boundaries.md
index 927fc6abb..1e565ab2a 100644
--- a/docs/architecture/crate-boundaries.md
+++ b/docs/architecture/crate-boundaries.md
@@ -82,3 +82,28 @@ The current decision is recorded in
 global server-config state in `ecstore`, and preserve the old
 `rustfs_ecstore::config::*` path with a temporary compatibility marker during
 the first extraction.
+
+## Loss-Prevention Coverage
+
+Architecture migration checks must keep public contract re-exports and storage
+trait coverage from silently drifting during cleanup PRs.
+
+Required `rustfs-storage-api` public re-exports:
+
+- `pub use admin::{DiskSetSelector, StorageAdminApi};`
+- `pub use bucket::{BucketInfo, BucketOptions, DeleteBucketOptions, MakeBucketOptions, SRBucketDeleteOp};`
+- `pub use error::{StorageErrorCode, StorageResult};`
+
+Required `StorageAPI` operation groups:
+
+- `ObjectIO`
+- `BucketOperations`
+- `ObjectOperations`
+- `ListOperations`
+- `MultipartOperations`
+- `HealOperations`
+- `Debug`
+
+`NamespaceLocking` must remain a separate operation group from the full
+`StorageAPI` facade. ECStore must keep compile-time coverage for both
+`StorageAdminApi` and `StorageAPI + NamespaceLocking`.
diff --git a/docs/architecture/migration-progress.md b/docs/architecture/migration-progress.md
index 9bea1fd68..85be0f038 100644
--- a/docs/architecture/migration-progress.md
+++ b/docs/architecture/migration-progress.md
@@ -5,18 +5,18 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 ## Current Context
 
 - Issue: [`rustfs/backlog#660`](https://github.com/rustfs/backlog/issues/660)
-- Branch: `overtrue/arch-startup-command-bootstrap`
-- Baseline: `origin/main` at `941b8afee8619c6a038c20aac51565a65c959ee4`
-- PR type for this branch: `pure-move`
-- Runtime behavior changes: no external behavior change expected; the binary
-  entrypoint still builds the Tokio runtime, applies preflight, dispatches
-  non-server commands, and starts server/bootstrap stages in the same order.
-- Rust code changes: add `startup_entrypoint::run_process`, move remaining
-  command dispatch, server bootstrap orchestration, and fatal stderr helpers
-  out of `main.rs`, and keep `main.rs` as the process entry shim.
-- CI/script changes: none.
-- Docs changes: record `R-019` startup command/bootstrap entrypoint progress
-  and update startup timeline ownership.
+- Branch: `overtrue/arch-loss-prevention-guards`
+- Baseline: `origin/main` at `dd6b4c35ad2c24be432c32645ce17e2d312eac78`
+- PR type for this branch: `ci-gate`
+- Runtime behavior changes: no external behavior change expected.
+- Rust code changes: split lifecycle transition compensation bucket
+  reservation from background backfill spawning so the dedupe unit test does
+  not launch an actual compensation task on shared test state.
+- CI/script changes: extend `scripts/check_architecture_migration_rules.sh` to
+  guard public storage-api re-exports, StorageAPI operation-group coverage,
+  NamespaceLocking separation, and ECStore compatibility tests.
+- Docs changes: record `G-006` completion and document the guarded
+  loss-prevention coverage in `crate-boundaries.md`.
 
 ## Phase 0 Tasks
 
@@ -33,12 +33,17 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 - [x] `G-005` Add dependency direction guard.
   - Acceptance: `./scripts/check_layer_dependencies.sh` passes on current
     `upstream/main` while still rejecting new unaccepted layer dependencies.
-- [~] `G-006` Create migration loss-prevention checks.
-  - Current branch: add a mechanical admin route matrix guard from
+- [x] `G-006` Create migration loss-prevention checks.
+  - Completed slices: add a mechanical admin route matrix guard from
     [`admin-route-action-snapshot.md`](admin-route-action-snapshot.md) and
-    `rustfs/src/admin/route_registration_test.rs`.
-  - Remaining follow-up: add checks for public re-export and storage trait
-    coverage before pure moves.
+    `rustfs/src/admin/route_registration_test.rs`; add migration rules for
+    public storage-api re-export coverage, StorageAPI operation-group coverage,
+    NamespaceLocking separation, and ECStore compatibility-test coverage.
+  - Acceptance: architecture migration rules fail if the public storage-api
+    contract re-export surface drifts, if `StorageAPI` stops covering the
+    documented storage operation groups, if `NamespaceLocking` is folded back
+    into the full storage facade, or if ECStore compile-time compatibility tests
+    for these contracts are removed.
 - [x] `G-007` Create startup timeline table.
   - Acceptance: [`startup-timeline.md`](startup-timeline.md) records current
     binary startup order, side effects, fatal boundaries, and readiness stages.
@@ -740,52 +745,51 @@ Status values: `[ ]` not started, `[~]` in progress, `[x]` complete, `[!]` block
 
 ## Next PRs
 
-1. `pure-move`: continue shrinking startup entrypoint orchestration only where a
-   clean module boundary remains without changing fatal stderr behavior.
-2. `ci-gate`: finish `G-006` public re-export and storage trait coverage checks
-   before the remaining cleanup slices.
+1. `pure-move`/`consumer-migration`: continue larger cleanup slices with the
+   loss-prevention guards active for public re-exports and storage trait
+   coverage.
 
 ## Pre-Push Review Log
 
 | Expert | Status | Notes |
 |---|---|---|
-| Quality/architecture | passed | Pure-move slice removes command dispatch and bootstrap orchestration details from binary startup behind a dedicated startup entrypoint boundary. |
-| Migration preservation | passed | Command parse stderr, info/TLS dispatch, observability fatal sentinel, startup order, readiness publication, and shutdown ownership are preserved. |
-| Testing/verification | passed | Focused startup entrypoint and observability guardrail tests, compile checks, formatting, migration/layer guards, Rust risk scan, branch freshness check, and full `make pre-commit` passed. |
+| Quality/architecture | passed | CI-gate slice extends the existing migration rule script instead of adding a parallel guard system. |
+| Migration preservation | passed | Guards fail on public storage-api re-export drift, StorageAPI operation-group drift, NamespaceLocking collapse, or missing ECStore compatibility tests without changing runtime behavior. |
+| Testing/verification | passed | Script syntax, migration/layer guards, lifecycle compensation dedupe test, ECStore compatibility test, compile check, formatting, diff hygiene, and full `make pre-commit` passed. |
 
 ## Verification Notes
 
-Passed on `941b8afee8619c6a038c20aac51565a65c959ee4`:
+Passed on `dd6b4c35ad2c24be432c32645ce17e2d312eac78`:
 
-- `cargo test -p rustfs startup_entrypoint --no-fail-fast`: passed.
-- `cargo test -p rustfs-obs startup_ --no-fail-fast`: passed.
-- `cargo check -p rustfs --lib`: passed.
-- `cargo check -p rustfs --bin rustfs`: passed.
-- `cargo fmt --all --check`: passed.
-- `git diff --check`: passed.
+- `bash -n scripts/check_architecture_migration_rules.sh`: passed.
 - `./scripts/check_architecture_migration_rules.sh`: passed.
 - `./scripts/check_layer_dependencies.sh`: passed.
-- Added-line and changed-file Rust risk scan: expected fatal-boundary
-  `expect`/`eprintln!` only.
-- Full-file risk scan for changed Rust files: expected process exit and fatal
-  stderr entries are isolated in `startup_entrypoint.rs`.
-- `make pre-commit`: passed, including nextest `6038` passed / `111` skipped
-  and doctests.
+- `cargo test -p rustfs-ecstore --test storage_api_compat_test --no-fail-fast`:
+  passed.
+- `cargo test -p rustfs-ecstore bucket::lifecycle::bucket_lifecycle_ops::tests::reserve_bucket_compensation_deduplicates_same_bucket --no-fail-fast`:
+  passed.
+- `cargo check -p rustfs-ecstore`: passed.
+- `cargo fmt --all --check`: passed.
+- `git diff --check`: passed.
+- Rust risk scan: no new production `unwrap`/`expect`, lossy casts, string
+  errors, public boxed errors, or production `println`/`eprintln`.
+- `make pre-commit`: passed.
 - `git rev-list --left-right --count HEAD...origin/main`: returned `1 0`
   after commit.
 
 Notes:
 
-- This slice centralizes remaining command/bootstrap entrypoint orchestration
-  without changing startup ordering, fatal stderr behavior, readiness ownership,
-  shutdown token ownership, or shutdown handle ownership.
-- Ready publication, scanner start, and shutdown wait remain owned by
-  `startup_services`; `startup_entrypoint` only orchestrates the existing
-  startup sequence and process-level fatal handling.
+- This slice completes the `G-006` loss-prevention follow-up with script-level
+  checks for the public re-export and storage trait coverage called out in the
+  migration checklist.
+- The script reads existing source/test surfaces and does not introduce a new
+  runtime behavior path.
+- The lifecycle compensation dedupe test now covers reservation directly,
+  avoiding a spawned backfill task that can inherit shared object-store test
+  state during the full pre-commit run.
 
 ## Handoff Notes
 
-- R-019 is implemented, locally verified, and current with `origin/main`.
-- Next startup slices can keep using larger pure moves, but must keep startup
-  ordering, fatal/non-fatal boundaries, shutdown ownership, readiness ownership,
-  and fatal stderr behavior explicit in tests and review notes.
+- G-006 is implemented, locally verified, and current with `origin/main`.
+- Larger cleanup slices can now rely on migration rules to catch accidental
+  public storage-api re-export drift and storage trait coverage loss.
diff --git a/scripts/check_architecture_migration_rules.sh b/scripts/check_architecture_migration_rules.sh
index c7334f02e..753e0e00b 100755
--- a/scripts/check_architecture_migration_rules.sh
+++ b/scripts/check_architecture_migration_rules.sh
@@ -21,6 +21,26 @@ contains_line() {
   grep -qxF "$needle" "$file"
 }
 
+require_source_line() {
+  local file="$1"
+  local expected="$2"
+  local description="$3"
+
+  if ! contains_line "$expected" "${ROOT_DIR}/${file}"; then
+    report_failure "${description} missing exact source line in ${file}: ${expected}"
+  fi
+}
+
+require_source_contains() {
+  local file="$1"
+  local expected="$2"
+  local description="$3"
+
+  if ! grep -qF "$expected" "${ROOT_DIR}/${file}"; then
+    report_failure "${description} missing source text in ${file}: ${expected}"
+  fi
+}
+
 TMP_DIR="$(mktemp -d)"
 trap 'rm -rf "$TMP_DIR"' EXIT
 
@@ -29,6 +49,7 @@ PR_TYPE_HITS_FILE="${TMP_DIR}/pr_type_hits.txt"
 SOURCE_MARKERS_FILE="${TMP_DIR}/source_markers.txt"
 SOURCE_IDS_FILE="${TMP_DIR}/source_ids.txt"
 REGISTER_IDS_FILE="${TMP_DIR}/register_ids.txt"
+STORAGE_API_SUPERTRAITS_FILE="${TMP_DIR}/storage_api_supertraits.txt"
 
 awk '
   /^## PR Types$/ {
@@ -153,6 +174,56 @@ while IFS= read -r register_id; do
   fi
 done <"$REGISTER_IDS_FILE"
 
+require_source_line \
+  "crates/storage-api/src/lib.rs" \
+  "pub use admin::{DiskSetSelector, StorageAdminApi};" \
+  "storage-api public admin contract re-export"
+require_source_line \
+  "crates/storage-api/src/lib.rs" \
+  "pub use bucket::{BucketInfo, BucketOptions, DeleteBucketOptions, MakeBucketOptions, SRBucketDeleteOp};" \
+  "storage-api public bucket DTO re-export"
+require_source_line \
+  "crates/storage-api/src/lib.rs" \
+  "pub use error::{StorageErrorCode, StorageResult};" \
+  "storage-api public error contract re-export"
+
+perl -0ne '
+  if (/pub trait StorageAPI:\s*(.*?)\s*\{\s*\}/s) {
+    my $body = $1;
+    while ($body =~ /\b([A-Z][A-Za-z0-9_]*)\b/g) {
+      print "$1\n";
+    }
+  }
+' "${ROOT_DIR}/crates/ecstore/src/store_api/traits.rs" |
+  sort -u >"$STORAGE_API_SUPERTRAITS_FILE"
+
+if [[ ! -s "$STORAGE_API_SUPERTRAITS_FILE" ]]; then
+  report_failure "StorageAPI supertrait declaration not found in crates/ecstore/src/store_api/traits.rs"
+fi
+
+for required_trait in ObjectIO BucketOperations ObjectOperations ListOperations MultipartOperations HealOperations Debug; do
+  if ! contains_line "$required_trait" "$STORAGE_API_SUPERTRAITS_FILE"; then
+    report_failure "StorageAPI no longer covers required operation group ${required_trait}"
+  fi
+done
+
+if contains_line "NamespaceLocking" "$STORAGE_API_SUPERTRAITS_FILE"; then
+  report_failure "NamespaceLocking must remain separate from the full StorageAPI facade"
+fi
+
+require_source_contains \
+  "crates/ecstore/src/store_api/traits.rs" \
+  "pub trait NamespaceLocking: Send + Sync + Debug + 'static" \
+  "separate namespace-locking operation-group trait"
+require_source_contains \
+  "crates/ecstore/tests/storage_api_compat_test.rs" \
+  "fn ecstore_implements_storage_admin_api_contract()" \
+  "ECStore StorageAdminApi compile-time coverage test"
+require_source_contains \
+  "crates/ecstore/tests/storage_api_compat_test.rs" \
+  "fn ecstore_implements_storage_api_and_namespace_locking_contracts()" \
+  "ECStore StorageAPI and NamespaceLocking compile-time coverage test"
+
 if (( FAILURES > 0 )); then
   exit 1
 fi