Remove legacy layout and ship lock-free C#/C++/Python protocol

.gitattributes

@@ -1 +1,4 @@
 protocol/fixtures/v1.2/*.snapshot.json text eol=lf
+protocol/fixtures/v2.0/*.json text eol=lf
+protocol/fixtures/v2.0/offline/*.json text eol=lf
+protocol/fixtures/v2.0/offline/*.bin binary

.github/workflows/ci.yml

@@ -32,6 +32,12 @@ jobs:
         with:
           dotnet-version: 10.0.x
 
+      - name: Validate SMS2-only qualification policy
+        shell: pwsh
+        run: |
+          ./scripts/validate-lock-free-os.ps1 -Command self-test -Configuration Release -ValidateOnly
+          ./scripts/run-lock-free-qualification.ps1 -Tier pr -Configuration Release -ValidateOnly
+
       - name: Restore
         run: dotnet restore SharedMemoryStore.slnx
 
@@ -51,7 +57,7 @@ jobs:
         shell: pwsh
         run: ./scripts/validate-docs.ps1
 
-      - name: Validate package consumption
+      - name: Validate SMS2 package consumption
         shell: pwsh
         run: ./scripts/validate-package-consumption.ps1 -Configuration Release
 
@@ -72,7 +78,7 @@ jobs:
         with:
           dotnet-version: 10.0.x
 
-      - name: Validate Docker sharing
+      - name: Validate SMS2 Docker sharing
         shell: pwsh
         run: ./scripts/validate-docker-shared-memory.ps1 -Configuration Release
 
@@ -89,7 +95,7 @@ jobs:
       - name: Check out source
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
-      - name: Validate CMake build, tests, install, and clean consumer
+      - name: Validate SMS2 CMake build, tests, install, and clean consumer
         shell: pwsh
         run: ./scripts/validate-native.ps1 -Configuration Release
 
@@ -114,7 +120,7 @@ jobs:
       - name: Install Python build frontend
         run: python -m pip install --upgrade build
 
-      - name: Validate source tests, wheel contents, and clean installation
+      - name: Validate SMS2 source tests, distributions, and clean installation
         shell: pwsh
         run: ./scripts/validate-python.ps1 -Configuration Release
 
@@ -142,7 +148,7 @@ jobs:
         with:
           python-version: '3.12'
 
-      - name: Validate all ordered runtime pairs and stress lifecycles
+      - name: Validate all ordered SMS2 runtime pairs and stress lifecycles
         shell: pwsh
         run: >-
           ./scripts/validate-interoperability.ps1

.specify/feature.json

@@ -1,3 +1 @@
-{
-  "feature_directory": "specs/009-lock-free-publish-read"
-}
+{"feature_directory":"specs\\010-lock-free-only-multilang"}

AGENTS.md

@@ -1,5 +1,5 @@
 <!-- SPECKIT START -->
 For additional context about technologies to be used, project structure,
 shell commands, and other important information, read the current plan
-at specs/009-lock-free-publish-read/plan.md
+at specs/010-lock-free-only-multilang/plan.md
 <!-- SPECKIT END -->

CHANGELOG.md

@@ -5,6 +5,54 @@ chronological order.
 
 ## Unreleased
 
+## 3.0.0 - 2026-07-16
+
+### Breaking changes
+
+- NuGet `SharedMemoryStore` now creates and reads only SMS2 layout `2.0`,
+  resource protocol `2`, required-feature mask `7`, and optional-feature mask
+  `0`.
+- Removed the alternate layout selector, compatibility creator, fallback
+  engine, and retired mapped-record surface. Ordinary
+  `SharedMemoryStoreOptions.Create(...)` and `CalculateRequiredBytes(...)` are
+  the only managed sizing and creation helpers.
+- A noncurrent, unknown, or malformed mapping is rejected with
+  `IncompatibleLayout` before key, descriptor, payload, slot, lease, or
+  participant projection. There is no in-place conversion.
+
+### Added
+
+- Completed independent native `SharedMemoryStore` `1.0.0` and Python
+  `shared-memory-store` `1.0.0` distributions on the same SMS2 protocol.
+- Advanced the fixed-width native boundary to C ABI `2.0`, including
+  participant-aware layout sizing, protocol identity, cancellation, expanded
+  diagnostics, lifecycle operations, and ownership-safe opaque tokens.
+- Added complete C++, Python, and nine ordered .NET/C++/Python interoperability
+  coverage for publication, reservations, leases, removal/reuse, recovery,
+  participant capacity, diagnostics, corruption rejection, and held-cold-lock
+  progress.
+
+### Changed
+
+- Hot publish, segmented publish, reserve, commit, abort, acquire, release,
+  remove, reclaim, recovery help, and diagnostics use mapped lock-free atomics
+  and bounded helping; OS synchronization is limited to cold create/open/close
+  coordination.
+- Managed diagnostics now expose the canonical five-field protocol identity,
+  SMS2 participant and directory state, and local retry/help/token/recovery
+  telemetry without obsolete tombstone or compaction fields.
+- Updated NuGet metadata and XML documentation for version `3.0.0`, CMake
+  metadata for version `1.0.0`/ABI `2.0`, and Python metadata for version
+  `1.0.0`/required ABI `2.0`.
+
+### Migration
+
+- Stop writers and readers, drain leases and reservations, close every handle,
+  remove or replace the noncurrent physical store, create a fresh SMS2 store,
+  and republish values from an application-owned authoritative source.
+- A side-by-side cutover must use a distinct public store name. Current clients
+  do not read an old mapping as a migration source.
+
 ## 2.0.0 - 2026-07-13
 
 ### Added

CMakeLists.txt

@@ -2,10 +2,27 @@ cmake_minimum_required(VERSION 3.20)
 
 project(
     SharedMemoryStore
-    VERSION 0.1.0
+    VERSION 1.0.0
     DESCRIPTION "Cross-process shared memory value store"
     LANGUAGES CXX)
 
+if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
+    message(FATAL_ERROR "SharedMemoryStore SMS2 requires a 64-bit process.")
+endif()
+string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" _sms_system_processor)
+if(NOT _sms_system_processor MATCHES "^(amd64|x86_64|x64)$")
+    message(
+        FATAL_ERROR
+            "SharedMemoryStore SMS2 requires x86-64; detected '${CMAKE_SYSTEM_PROCESSOR}'.")
+endif()
+unset(_sms_system_processor)
+include(TestBigEndian)
+test_big_endian(_sms_is_big_endian)
+if(_sms_is_big_endian)
+    message(FATAL_ERROR "SharedMemoryStore SMS2 requires little-endian x86-64.")
+endif()
+unset(_sms_is_big_endian)
+
 include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
 find_package(Threads REQUIRED)