refactor(protos): move compat manifest send-site assertions into owning crates (#6618)

refactor(protos): move internode compat manifest send-site assertions into owning crates

Promotes the rolling-upgrade dual-write manifest from a test-only constant in rustfs-protos into the public rustfs_protos::compat_manifest module, moves the JSON-encoder send-site assertions into the crates that own the asserted sources (ecstore remote_disk.rs for requests, the rustfs binary node_service/disk.rs for responses), and splits the scanner Phase-0 overlap inventory so its heal- and ecstore-owned halves live in those crates. Adds a cross-crate include_str!/include! guard with fixture self-tests to scripts/check_layer_dependencies.sh so a library crate can never again read another crate's Rust source at compile time, and records the rule in docs/architecture/crate-boundaries.md.

Part of rustfs/backlog#1884.

crates/heal/tests/auto_scan_admission_contract_test.rs

@@ -0,0 +1,26 @@
+// Copyright 2024 RustFS Team
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Heal-owned half of the scanner/heal overlap Phase-0 inventory (formerly a
+//! cross-crate source include in crates/scanner). The assertions deliberately
+//! check that the documented admission guards still exist; they do not claim
+//! that a shared admission primitive already exists.
+
+const HEAL_AUTO_SCAN_SOURCE: &str = include_str!("../src/heal/manager/auto_scan.rs");
+
+#[test]
+fn auto_scan_overlap_inventory_keeps_admission_guards() {
+    assert!(HEAL_AUTO_SCAN_SOURCE.contains("active_heals"));
+    assert!(HEAL_AUTO_SCAN_SOURCE.contains("contains_erasure_set"));
+}