diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6275b97..60eb9ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 ## Unreleased
 
+- Make Keel's validated `app-schema` the canonical in-memory input to Swift,
+  C++, and Kotlin client generation. Rivet now keeps only a fail-closed
+  Keel-to-RVT1 type adapter instead of reconstructing a parallel codegen schema
+  model, while preserving generated source and schema snapshot compatibility.
+- Synchronize the English and Chinese CI guide with the pinned Ubuntu 24.04
+  runner and remove a stale comment about the now-opaque State descriptor.
+
 ## 0.7.0
 
 - Stage Racket's bundled foreign runtime libraries (`libeay32.dll`,
diff --git a/README.md b/README.md
index 7ef1413..df5234a 100644
--- a/README.md
+++ b/README.md
@@ -347,7 +347,7 @@ The maintained Taskboard also has platform-native [UI end-to-end gates](docs/nat
   - [x] Kotlin typed-client generation
   - [x] clean-runner build/package/verify evidence for every supported desktop architecture
 - [x] **Phase 7 — desktop production graduation** — real Linux install/upgrade evidence, first-party update installation adapters, native UI end-to-end gates, and characterization-protected maintainability work; see the [graduation record](docs/production-roadmap.md)
-- [ ] **Phase 8 — 1.0 contract stabilization** — incrementally source generated-client inputs from Keel, evaluate Float64/map/structured-error RVT1 extensions only with cross-runtime golden and fuzz evidence, and align portable distribution metadata without moving platform installer policy into Keel
+- [ ] **Phase 8 — 1.0 contract stabilization** — use Keel as the canonical generated-client schema, evaluate Float64/map/structured-error RVT1 extensions only with cross-runtime golden and fuzz evidence, and align portable distribution metadata without moving platform installer policy into Keel
 - [ ] **Phase 9 — first-class device application delivery** — after the Windows/macOS/Linux 1.0 line is stable, add generated iOS/iPadOS/tvOS/visionOS/watchOS and Android projects, explicit embedded-runtime or companion roles, signing, packaging, and real-device verification
 
 ## License
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 7d9afde..e06ada4 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -343,7 +343,7 @@ CI 会验证 Racket、C++、Swift 与 Kotlin 协议实现，在三个桌面平
   - [x] Kotlin 类型客户端生成
   - [x] 覆盖每个受支持桌面架构的干净 runner 构建/打包/验证证据
 - [x] **Phase 7 —— 桌面生产晋级** —— 真实 Linux 安装/升级证据、一方更新安装适配器、原生 UI 端到端门禁，以及由特征测试保护的可维护性改造；详见[晋级记录](docs/production-roadmap.md)
-- [ ] **Phase 8 —— 1.0 契约稳定化** —— 渐进地让生成客户端以 Keel 为规范输入；Float64、map、结构化 error 等 RVT1 扩展只有在跨 runtime golden 与 fuzz 证据齐备时才引入；对齐可移植分发元数据，但平台安装器策略不进入 Keel
+- [ ] **Phase 8 —— 1.0 契约稳定化** —— 生成客户端统一以 Keel 为规范 Schema；Float64、map、结构化 error 等 RVT1 扩展只有在跨 runtime golden 与 fuzz 证据齐备时才引入；对齐可移植分发元数据，但平台安装器策略不进入 Keel
 - [ ] **Phase 9 —— 一等设备应用交付** —— Windows/macOS/Linux 1.0 主线稳定之后，再提供生成式 iOS/iPadOS/tvOS/visionOS/watchOS 与 Android 项目，明确 embedded-runtime 或 companion 角色，并补齐签名、打包和真机验证
 
 ## 许可证
diff --git a/docs/architecture.md b/docs/architecture.md
index a4a7b8f..9f1d23f 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -145,11 +145,12 @@ forms, Event/State operations, `serve`/`serve-fds`, diagnostics, and schema
 snapshots. The registry structs, RPC procedures, mutable State cells, locks,
 and request custodians are runtime-owned implementation details.
 
-Build tools load the application in a fresh namespace and call
-`backend-schema`. That one immutable, data-only snapshot is the supported
-reflection boundary; generators do not reach into runtime structs. This keeps
-code generation deterministic and lets the server's concurrency machinery
-evolve without turning internal representation into an accidental API.
+Build tools load the application in a fresh namespace, project its immutable
+`backend-schema` snapshot into a Keel `app-schema`, and use that canonical
+contract as the input to code generation. Generators do not reach into runtime
+structs or maintain a second schema object model. This keeps code generation
+deterministic and lets the server's concurrency machinery evolve without
+turning internal representation into an accidental API.
 
 The terminal-ownership state machine for active requests lives in the private
 `backend-pending` module. It owns admission capacity, exactly-once terminal
@@ -179,12 +180,13 @@ Typed generated clients are layered on top of this codec. The current schema sup
 
 `rivet/keel` projects the immutable `backend-schema` snapshot into Keel's
 transport-neutral `app-schema`. Keel owns the common type, schema, lifecycle,
-and canonical introspection vocabulary shared with Glaze; Rivet continues to
-own RVT1 framing, typed native code generation, embedded-runtime lifecycle,
-and the WinUI, SwiftUI/AppKit, and GTK4/Wayland adapters. The projection does
-not enable Keel's additional value tags on RVT1. RVT1 v1 Errors also remain
-bounded diagnostic strings, so projected commands advertise no structured
-error codes until that wire boundary changes deliberately.
+canonical introspection vocabulary, and the in-memory objects consumed by
+Rivet's native code generators. Rivet continues to own RVT1 framing, the
+Keel-to-RVT1 type adapter, generated-language policy, embedded-runtime
+lifecycle, and the WinUI, SwiftUI/AppKit, and GTK4/Wayland adapters. The
+projection does not enable Keel's additional value tags on RVT1. RVT1 v1
+Errors also remain bounded diagnostic strings, so projected commands advertise
+no structured error codes until that wire boundary changes deliberately.
 
 Migrating a Swift call site from the pre-namespace emission is mechanical
 — qualify the type once:
diff --git a/docs/ci.md b/docs/ci.md
index 7069f78..cec8edc 100644
--- a/docs/ci.md
+++ b/docs/ci.md
@@ -11,7 +11,7 @@ uses:
 - Windows: `windows-latest` for the WinUI 3 host;
 - macOS: both `macos-latest` and `macos-15`, so current Swift and the pinned
   Xcode 16 release environment both compile the SwiftUI/AppKit host;
-- Linux: `ubuntu-latest` with GTK4 development files and an embeddable Racket
+- Linux: `ubuntu-24.04` with GTK4 development files and an embeddable Racket
   CS runtime.
 
 `raco rivet build` is the required host-compilation gate. Add `package` and
@@ -73,7 +73,7 @@ jobs:
       - run: raco rivet build
 
   linux-host:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v7
       - name: Set up embeddable Racket CS
diff --git a/docs/ci.zh-CN.md b/docs/ci.zh-CN.md
index f14ef81..05bc3d4 100644
--- a/docs/ci.zh-CN.md
+++ b/docs/ci.zh-CN.md
@@ -10,7 +10,7 @@ CI 应使用与发布任务相同类别的 runner 和工具链：
 - Windows：用 `windows-latest` 编译 WinUI 3 宿主；
 - macOS：同时使用 `macos-latest` 与 `macos-15`，分别覆盖当前 Swift 和
   固定的 Xcode 16 发布环境；
-- Linux：用 `ubuntu-latest`，安装 GTK4 开发文件，并准备可嵌入的 Racket
+- Linux：用 `ubuntu-24.04`，安装 GTK4 开发文件，并准备可嵌入的 Racket
   CS runtime。
 
 `raco rivet build` 是必需的宿主编译门禁。若还要验证分发布局，可继续执行
@@ -69,7 +69,7 @@ jobs:
       - run: raco rivet build
 
   linux-host:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v7
       - name: Set up embeddable Racket CS
diff --git a/rivet-cli/codegen.rkt b/rivet-cli/codegen.rkt
index c363969..6fa3b0e 100644
--- a/rivet-cli/codegen.rkt
+++ b/rivet-cli/codegen.rkt
@@ -22,7 +22,8 @@
 
 (define (generate-clients! project)
   (define backend (project-path project (project-ref project 'backend)))
-  (define-values (rpcs events states records enums) (load-schema backend))
+  (define-values (rpcs events states records enums)
+    (load-schema backend #:id (project-identifier project)))
   (define module-name (project-ref project 'module))
   (define entry-name (project-ref project 'entry))
   (define display-name (project-display-name project))
diff --git a/rivet-cli/codegen/model.rkt b/rivet-cli/codegen/model.rkt
index b3c1673..7271b4d 100644
--- a/rivet-cli/codegen/model.rkt
+++ b/rivet-cli/codegen/model.rkt
@@ -1,51 +1,131 @@
 #lang racket/base
 
 (require racket/list
+         (prefix-in keel: keel)
          "../project.rkt")
 
-(provide (struct-out schema-rpc)
-         (struct-out schema-event)
-         (struct-out schema-state)
-         (struct-out schema-record)
-         (struct-out schema-enum)
+(provide schema-rpc?
+         schema-rpc-name
+         schema-rpc-arg-names
+         schema-rpc-arg-types
+         schema-rpc-result-type
+         schema-event?
+         schema-event-name
+         schema-event-type
+         schema-state?
+         schema-state-name
+         schema-state-type
+         schema-record?
+         schema-record-name
+         schema-record-field-names
+         schema-record-field-types
+         schema-enum?
+         schema-enum-name
+         schema-enum-cases
          load-schema
          schema-name
          resolve-device-rpcs
          upper-first
          record-native-name)
 
-(struct schema-rpc (name arg-names arg-types result-type) #:transparent)
-(struct schema-event (name type) #:transparent)
-(struct schema-state (name type) #:transparent)
-(struct schema-record (name field-names field-types) #:transparent)
-(struct schema-enum (name cases) #:transparent)
+(define schema-rpc? keel:schema-command?)
+(define schema-event? keel:schema-event?)
+(define schema-state? keel:schema-state?)
+(define schema-record? keel:schema-record?)
+(define schema-enum? keel:schema-enum?)
+(define-namespace-anchor model-namespace-anchor)
 
-(define (load-schema backend)
+;; Native generators still target RVT1's deliberately smaller type system.
+;; Keep that transport mapping in one adapter while Keel remains the canonical
+;; in-memory schema. Unsupported Keel types fail here instead of being silently
+;; approximated by a generator.
+(define (keel-type->rvt1-type type)
+  (cond
+    [(keel:scalar-type? type)
+     (case (keel:scalar-type-name type)
+       [(Bool Int64 String Bytes) (keel:scalar-type-name type)]
+       [(Unit) 'Void]
+       [(Value) 'Any]
+       [else
+        (raise-arguments-error 'load-schema
+                               "Keel type is not supported by RVT1"
+                               "type" type)])]
+    [(keel:list-type? type)
+     (list 'List (keel-type->rvt1-type (keel:list-type-element type)))]
+    [(keel:optional-type? type)
+     (list 'Optional
+           (keel-type->rvt1-type (keel:optional-type-element type)))]
+    [(keel:reference-type? type)
+     (string->symbol (keel:reference-type-name type))]
+    [else
+     (raise-arguments-error 'load-schema
+                            "Keel type is not supported by RVT1"
+                            "type" type)]))
+
+(define (schema-rpc-name rpc)
+  (string->symbol (keel:schema-command-name rpc)))
+
+(define (schema-rpc-arg-names rpc)
+  (for/list ([parameter (in-list (keel:schema-command-parameters rpc))])
+    (string->symbol (keel:schema-parameter-name parameter))))
+
+(define (schema-rpc-arg-types rpc)
+  (for/list ([parameter (in-list (keel:schema-command-parameters rpc))])
+    (keel-type->rvt1-type (keel:schema-parameter-type parameter))))
+
+(define (schema-rpc-result-type rpc)
+  (keel-type->rvt1-type (keel:schema-command-result rpc)))
+
+(define (schema-event-name event)
+  (string->symbol (keel:schema-event-name event)))
+
+(define (schema-event-type event)
+  (keel-type->rvt1-type (keel:schema-event-type event)))
+
+(define (schema-state-name state)
+  (string->symbol (keel:schema-state-name state)))
+
+(define (schema-state-type state)
+  (keel-type->rvt1-type (keel:schema-state-type state)))
+
+(define (schema-record-name record)
+  (string->symbol (keel:schema-record-name record)))
+
+(define (schema-record-field-names record)
+  (for/list ([field (in-list (keel:schema-record-fields record))])
+    (string->symbol (keel:schema-field-name field))))
+
+(define (schema-record-field-types record)
+  (for/list ([field (in-list (keel:schema-record-fields record))])
+    (keel-type->rvt1-type (keel:schema-field-type field))))
+
+(define (schema-enum-name enum)
+  (string->symbol (keel:schema-enum-name enum)))
+
+(define (schema-enum-cases enum)
+  (map string->symbol (keel:schema-enum-cases enum)))
+
+(define (load-schema backend #:id [id "rivet.codegen"])
   ;; Backends register declarations as a module side effect.  A fresh
   ;; namespace keeps separate projects from sharing a registry accidentally.
+  ;; Attach Keel from the caller namespace so the isolated Rivet instance
+  ;; returns canonical structs recognized by these accessors; only Rivet's
+  ;; mutable backend registry must be instantiated per project.
   (define ns (make-base-namespace))
+  (namespace-attach-module
+   (namespace-anchor->namespace model-namespace-anchor)
+   'keel
+   ns)
   (parameterize ([current-namespace ns])
     (dynamic-require backend #f)
-    (define get-schema (dynamic-require 'rivet/backend 'backend-schema))
-    (define schema (get-schema))
-    (values
-     (for/list ([info (in-list (hash-ref schema 'rpcs))])
-       (define arguments (hash-ref info 'arguments))
-       (schema-rpc (hash-ref info 'name)
-                   (map (lambda (argument) (hash-ref argument 'name)) arguments)
-                   (map (lambda (argument) (hash-ref argument 'type)) arguments)
-                   (hash-ref info 'result)))
-     (for/list ([info (in-list (hash-ref schema 'events))])
-       (schema-event (hash-ref info 'name) (hash-ref info 'type)))
-     (for/list ([info (in-list (hash-ref schema 'states))])
-       (schema-state (hash-ref info 'name) (hash-ref info 'type)))
-     (for/list ([info (in-list (hash-ref schema 'records))])
-       (define fields (hash-ref info 'fields))
-       (schema-record (hash-ref info 'name)
-                      (map (lambda (field) (hash-ref field 'name)) fields)
-                      (map (lambda (field) (hash-ref field 'type)) fields)))
-     (for/list ([info (in-list (hash-ref schema 'enums))])
-       (schema-enum (hash-ref info 'name) (hash-ref info 'cases))))))
+    (define current-schema
+      (dynamic-require 'rivet/keel 'current-backend-app-schema))
+    (define schema (current-schema #:id id))
+    (values (keel:app-schema-commands schema)
+            (keel:app-schema-events schema)
+            (keel:app-schema-states schema)
+            (keel:app-schema-records schema)
+            (keel:app-schema-enums schema))))
 
 (define (schema-name value)
   (if (symbol? value) (symbol->string value) value))
diff --git a/rivet-cli/codegen/snapshot.rkt b/rivet-cli/codegen/snapshot.rkt
index b18c3ff..14b7e29 100644
--- a/rivet-cli/codegen/snapshot.rkt
+++ b/rivet-cli/codegen/snapshot.rkt
@@ -33,7 +33,8 @@
 
 (define (schema-snapshot project)
   (define backend (project-path project (project-ref project 'backend)))
-  (define-values (rpcs events states records enums) (load-schema backend))
+  (define-values (rpcs events states records enums)
+    (load-schema backend #:id (project-identifier project)))
   (define device-rpcs (resolve-device-rpcs project rpcs 'schema-snapshot))
   (parameterize ([current-records records]
                  [current-enums enums])
diff --git a/rivet/backend.rkt b/rivet/backend.rkt
index 6e8868a..b550619 100644
--- a/rivet/backend.rkt
+++ b/rivet/backend.rkt
@@ -73,10 +73,10 @@
 ;; Keeping it private lets state-set! preserve the same behavior outside serve.
 (define current-state-commit-guard (make-parameter (lambda (thunk) (thunk))))
 
-;; `state-info` is public through struct-out, so keep update-order bookkeeping
-;; private instead of adding a field that would break constructor/pattern source
-;; compatibility. Weak identity keys also avoid retaining externally constructed
-;; State values after the application releases them.
+;; Keep update-order bookkeeping outside the opaque State descriptor. Weak
+;; identity keys avoid retaining State values after the application releases
+;; them and let the descriptor representation evolve without widening the
+;; public API.
 (define state-update-locks (make-weak-hasheq))
 (define state-update-locks-lock (make-semaphore 1))
 
diff --git a/tests/documentation.rkt b/tests/documentation.rkt
index 9dd71d2..5f3b69a 100644
--- a/tests/documentation.rkt
+++ b/tests/documentation.rkt
@@ -124,7 +124,7 @@
 (for ([expected (in-list '("windows-latest"
                            "macos-latest"
                            "macos-15"
-                           "ubuntu-latest"
+                           "ubuntu-24.04"
                            "setup-embed-racket"
                            "raco rivet build"))])
   (check-file-contains ci-guide expected))
diff --git a/tests/keel.rkt b/tests/keel.rkt
index 0aec6fa..d0f5568 100644
--- a/tests/keel.rkt
+++ b/tests/keel.rkt
@@ -1,8 +1,13 @@
 #lang racket/base
 
 (require rackunit
+         racket/runtime-path
          rivet
-         (prefix-in keel: keel))
+         (prefix-in keel: keel)
+         (prefix-in codegen: "../rivet-cli/codegen/model.rkt"))
+
+(define-runtime-path schema-matrix-backend
+  "fixtures/schema-matrix-backend.rkt")
 
 (define-enum AccessLevel (viewer editor owner))
 
@@ -40,6 +45,18 @@
 (check-equal? encoded (keel:encode-app-schema schema) "Keel introspection encoding is deterministic")
 (check-equal? (keel:decode-app-value encoded) (keel:app-schema->app-value schema))
 
+;; Code generation isolates each application's mutable Rivet registry in a
+;; fresh namespace, but it must still return canonical Keel schema values from
+;; the one shared Keel module instance.
+(define-values (codegen-commands codegen-events codegen-states
+                                 codegen-records codegen-enums)
+  (codegen:load-schema schema-matrix-backend #:id "rivet.codegen-test"))
+(check-true (andmap keel:schema-command? codegen-commands))
+(check-true (andmap keel:schema-event? codegen-events))
+(check-true (andmap keel:schema-state? codegen-states))
+(check-true (andmap keel:schema-record? codegen-records))
+(check-true (andmap keel:schema-enum? codegen-enums))
+
 (check-exn #rx"Unit is valid only as a command result"
            (lambda ()
              (backend-schema->app-schema (hash 'rpcs