diff --git a/deployment/requests/HLCC-NATIVE-SHARED-REPOSITORY-20260806.json b/deployment/requests/HLCC-NATIVE-SHARED-REPOSITORY-20260806.json
deleted file mode 100644
index 7d6054e..0000000
--- a/deployment/requests/HLCC-NATIVE-SHARED-REPOSITORY-20260806.json
+++ /dev/null
@@ -1,63 +0,0 @@
-{
-  "schema": "guanghu.architecture-provision-request/v1",
-  "request_id": "HLCC-NATIVE-SHARED-REPOSITORY-20260806",
-  "target_node": "JD-FD-PRIMARY",
-  "architecture_id": "GLS-HLCC-009",
-  "module": {
-    "code": "HLCC-JD-CANDIDATE-01",
-    "name": "光湖代码频道原生共享仓库权限修复",
-    "bind": "loopback:3340,3341",
-    "owner": "systemd",
-    "unit": "hlcc-jd-candidate.service",
-    "run_user": "guanghu",
-    "writable_paths": [
-      "/var/lib/guanghu/personas/guanghu/hlcc-v16.0.1"
-    ],
-    "read_only_paths": []
-  },
-  "source_ref": "REPO-012:refs/heads/main",
-  "deployed_commit_policy": "use the exact human-merged commit and record it in the server-owned deployment receipt",
-  "source_paths": [
-    "server-tools/hololake-code-channel/jd-candidate/hlcc-bootstrap.py",
-    "server-tools/hololake-code-channel/jd-candidate/app.ini",
-    "server-tools/hololake-code-channel/jd-candidate/hlcc-jd-candidate.service"
-  ],
-  "initial_provision": {
-    "kind": "new-architecture-unit",
-    "not_an_existing_action_bridge_extension": true,
-    "requires": [
-      "back up the currently installed hlcc-jd-candidate.service",
-      "install only the declared immutable source files",
-      "restart only hlcc-jd-candidate.service",
-      "set core.sharedRepository=group on the exact bingshuo/guanghu-ice-heart bare repository",
-      "remove only the identified obsolete guanghu-ice-heart sharing hook",
-      "preserve UMask=0077 for all other code-channel state",
-      "do not alter repository content, branches, owner identity or authentication"
-    ]
-  },
-  "verification": [
-    "the candidate health endpoint returns ready=true after restart",
-    "the exact repository reports core.sharedRepository as group",
-    "the obsolete post-receive chmod hook is absent",
-    "a later public push no longer emits recursive chmod permission warnings",
-    "both code-channel and authorized direct-receiver repository checks remain valid"
-  ],
-  "runtime_check": {
-    "url": "http://127.0.0.1:3341/health",
-    "expected": {
-      "ok": true,
-      "mode": "isolated-candidate",
-      "version": "16.0.1",
-      "code": "HLCC-JD-CANDIDATE-01",
-      "ready": true,
-      "stage": "ready"
-    }
-  },
-  "rollback": [
-    "restore the backed-up hlcc-jd-candidate.service",
-    "restart the previous immutable release",
-    "retain repository content and all authentication state",
-    "record any manual permission reconciliation separately"
-  ],
-  "status": "ARCHITECTURE_PACKAGE_READY · INITIAL_PROVISION_PENDING"
-}
diff --git a/server-tools/hololake-code-channel/jd-candidate/hlcc-bootstrap.py b/server-tools/hololake-code-channel/jd-candidate/hlcc-bootstrap.py
index 3a35229..35bcf9b 100644
--- a/server-tools/hololake-code-channel/jd-candidate/hlcc-bootstrap.py
+++ b/server-tools/hololake-code-channel/jd-candidate/hlcc-bootstrap.py
@@ -26,13 +26,6 @@ STATE_ROOT = pathlib.Path("/var/lib/guanghu/personas/guanghu/hlcc-v16.0.1")
 LEGACY_DB = STATE_ROOT / "data" / "owner-identity-source.db"
 OWNER_NAME = "bingshuo"
 CHANNEL_REPOSITORY = "guanghu-ice-heart"
-CHANNEL_REPOSITORY_PATH = (
-    STATE_ROOT
-    / "data"
-    / "repositories"
-    / OWNER_NAME
-    / f"{CHANNEL_REPOSITORY}.git"
-)
 LEGACY_REPOSITORY_URL = "https://guanghulab.com/fifth-domain/bingshuo/fifth-domain.git"
 SEED_COMMIT_NUMBER = "HLCC-ICE-000001"
 SEED_CONTRIBUTION_NUMBER = "ZY-CONTRIB-20260723-001"
@@ -480,59 +473,6 @@ def seed_fifth_domain_channel(binary: pathlib.Path) -> str:
         delete_bootstrap_token(channel_db, token_name)
 
 
-def configure_shared_channel_repository(
-    repository: pathlib.Path = CHANNEL_REPOSITORY_PATH,
-) -> str:
-    """Use Git's native shared-repository mode instead of a post-receive chmod."""
-    if not repository.is_dir():
-        raise RuntimeError("channel repository path unavailable")
-
-    subprocess.run(
-        [
-            "git",
-            "--git-dir",
-            str(repository),
-            "config",
-            "core.sharedRepository",
-            "group",
-        ],
-        check=True,
-        capture_output=True,
-        text=True,
-    )
-    configured = subprocess.run(
-        [
-            "git",
-            "--git-dir",
-            str(repository),
-            "config",
-            "--get",
-            "core.sharedRepository",
-        ],
-        check=True,
-        capture_output=True,
-        text=True,
-    ).stdout.strip()
-    if configured not in {"1", "group"}:
-        raise RuntimeError("shared repository configuration verification failed")
-
-    obsolete_hook = (
-        repository
-        / "hooks"
-        / "post-receive.d"
-        / "guanghu-ice-heart-share"
-    )
-    if obsolete_hook.exists():
-        if obsolete_hook.is_symlink() or not obsolete_hook.is_file():
-            raise RuntimeError("obsolete sharing hook path is unsafe")
-        hook_text = obsolete_hook.read_text(encoding="utf-8")
-        if "post_receive_permissions_reconciled" not in hook_text:
-            raise RuntimeError("obsolete sharing hook identity mismatch")
-        obsolete_hook.unlink()
-
-    return "configured"
-
-
 def bootstrap() -> None:
     process: subprocess.Popen[bytes] | None = None
     try:
@@ -574,8 +514,6 @@ def bootstrap() -> None:
         migrate_owner_identity()
         set_status(stage="seeding-fifth-domain-channel")
         seed_fifth_domain_channel(binary)
-        set_status(stage="configuring-shared-repository")
-        configure_shared_channel_repository()
         set_status(mode="isolated-candidate", ready=True, stage="ready")
         return_code = process.wait()
         raise RuntimeError(f"candidate stopped with code {return_code}")
diff --git a/server-tools/hololake-code-channel/jd-candidate/native.test.js b/server-tools/hololake-code-channel/jd-candidate/native.test.js
index bd6438f..336722e 100644
--- a/server-tools/hololake-code-channel/jd-candidate/native.test.js
+++ b/server-tools/hololake-code-channel/jd-candidate/native.test.js
@@ -47,10 +47,6 @@ assert.match(bootstrap, /password_hash_preserved/);
 assert.match(bootstrap, /access_tokens_migrated": False/);
 assert.match(bootstrap, /repositories_migrated": False/);
 assert.match(bootstrap, /delete from access_token/);
-assert.match(bootstrap, /core\.sharedRepository/);
-assert.match(bootstrap, /"group"/);
-assert.match(bootstrap, /obsolete sharing hook identity mismatch/);
-assert.match(bootstrap, /configure_shared_channel_repository\(\)/);
 assert.doesNotMatch(
   bootstrap,
   /print\s*\([^)]*token|stderr\.write\s*\([^)]*token|stdout\.write\s*\([^)]*token/,
diff --git a/server-tools/hololake-code-channel/jd-candidate/test_owner_migration.py b/server-tools/hololake-code-channel/jd-candidate/test_owner_migration.py
index 75cdf80..80a24cb 100644
--- a/server-tools/hololake-code-channel/jd-candidate/test_owner_migration.py
+++ b/server-tools/hololake-code-channel/jd-candidate/test_owner_migration.py
@@ -6,7 +6,6 @@ import importlib.util
 import json
 import pathlib
 import sqlite3
-import subprocess
 import tempfile
 import unittest
 
@@ -139,50 +138,5 @@ class OwnerMigrationTests(unittest.TestCase):
         self.assertEqual(MODULE.migrate_owner_identity(self.old, self.new, self.receipt), "already-present")
 
 
-class SharedRepositoryTests(unittest.TestCase):
-    def test_configures_native_group_sharing_and_removes_only_known_hook(self) -> None:
-        with tempfile.TemporaryDirectory() as temporary:
-            repository = pathlib.Path(temporary) / "channel.git"
-            subprocess.run(["git", "init", "--bare", str(repository)], check=True, capture_output=True)
-            hook = repository / "hooks" / "post-receive.d" / "guanghu-ice-heart-share"
-            hook.parent.mkdir(parents=True)
-            hook.write_text(
-                "#!/bin/sh\nprintf '%s\\n' post_receive_permissions_reconciled\n",
-                encoding="utf-8",
-            )
-
-            self.assertEqual(
-                MODULE.configure_shared_channel_repository(repository),
-                "configured",
-            )
-            configured = subprocess.run(
-                [
-                    "git",
-                    "--git-dir",
-                    str(repository),
-                    "config",
-                    "--get",
-                    "core.sharedRepository",
-                ],
-                check=True,
-                capture_output=True,
-                text=True,
-            ).stdout.strip()
-            self.assertIn(configured, {"1", "group"})
-            self.assertFalse(hook.exists())
-
-    def test_refuses_unknown_hook_content(self) -> None:
-        with tempfile.TemporaryDirectory() as temporary:
-            repository = pathlib.Path(temporary) / "channel.git"
-            subprocess.run(["git", "init", "--bare", str(repository)], check=True, capture_output=True)
-            hook = repository / "hooks" / "post-receive.d" / "guanghu-ice-heart-share"
-            hook.parent.mkdir(parents=True)
-            hook.write_text("#!/bin/sh\nexit 0\n", encoding="utf-8")
-
-            with self.assertRaisesRegex(RuntimeError, "identity mismatch"):
-                MODULE.configure_shared_channel_repository(repository)
-            self.assertTrue(hook.exists())
-
-
 if __name__ == "__main__":
     unittest.main()
diff --git a/server-tools/lake-lamp-authz/README.md b/server-tools/lake-lamp-authz/README.md
index 49f3f1d..8c08e32 100644
--- a/server-tools/lake-lamp-authz/README.md
+++ b/server-tools/lake-lamp-authz/README.md
@@ -124,10 +124,11 @@ node server-tools/lake-lamp-authz/authorize-repo-push.js \
 - 当裸仓库归属代码频道服务账户时，在系统 Git 配置中把该精确路径登记为
   `safe.directory`，不得使用通配符。
 
-光湖代码频道本身保留 `UMask=0077`，以免放宽数据库和其他状态目录。对需要由直达
-接收器共同读写的精确裸仓库设置 Git 原生 `core.sharedRepository=group`，让新建的
-`objects` 与 `refs` 从写入时就继承专用共享组权限。不要安装推送后递归 `chmod` 的
-钩子，也不要为了共享一个裸仓库而修改整个代码频道服务的 UMask。
+光湖代码频道本身保留 `UMask=0077`，以免放宽数据库和其他状态目录。仅在
+`guanghu-ice-heart.git/hooks/post-receive.d/guanghu-ice-heart-share` 安装仓库随附的
+`hooks/guanghu-ice-heart-post-receive`，让成功的公共 Git 推送完成后校正
+`objects` 与 `refs` 的共享组权限。不要为了共享一个裸仓库而修改整个代码频道服务的
+UMask。
 
 部署后用当前主分支生成无变化验收 bundle，经 `receiveBundle` 完整执行一次；验收前后
 主分支 SHA 必须一致，并且代码频道账户与授权服务账户执行 `git fsck` 均通过。
diff --git a/server-tools/lake-lamp-authz/hooks/guanghu-ice-heart-post-receive b/server-tools/lake-lamp-authz/hooks/guanghu-ice-heart-post-receive
new file mode 100755
index 0000000..9c0aeb8
--- /dev/null
+++ b/server-tools/lake-lamp-authz/hooks/guanghu-ice-heart-post-receive
@@ -0,0 +1,39 @@
+#!/bin/sh
+set -eu
+
+# The code-channel service runs with UMask=0077. Keep that isolation for its
+# database and other state, but make Git objects and refs readable/writable by
+# the repository's dedicated shared group after an accepted public push.
+cat >/dev/null
+repo_dir=$(git rev-parse --absolute-git-dir)
+expected_repo=/var/lib/guanghu/personas/guanghu/hlcc-v16.0.1/data/repositories/bingshuo/guanghu-ice-heart.git
+[ "$repo_dir" = "$expected_repo" ] || exit 0
+cd "$repo_dir"
+owner_uid=$(id -u)
+
+share_tree() {
+  # RestrictSUIDSGID forbids chmod calls that preserve a setgid directory.
+  # Existing shared directories are already traversable, so touch only new
+  # private directories and use a numeric mode that drops the special bit.
+  find "$1" -user "$owner_uid" -type d ! -perm -g=x -exec chmod 0770 {} +
+  find "$1" -user "$owner_uid" -type f ! -perm -g=r -exec chmod g+r {} +
+}
+
+share_tree "$repo_dir/objects"
+share_tree "$repo_dir/refs"
+
+# receive-pack may keep new objects in a quarantine directory until hooks have
+# completed. Normalize that directory before Git moves the objects into place.
+if [ -n "${GIT_OBJECT_DIRECTORY:-}" ] && [ -d "$GIT_OBJECT_DIRECTORY" ]; then
+  case "$GIT_OBJECT_DIRECTORY/" in
+    "$repo_dir/"*) share_tree "$GIT_OBJECT_DIRECTORY" ;;
+  esac
+fi
+
+for shared_file in HEAD packed-refs; do
+  if [ -f "$repo_dir/$shared_file" ]; then
+    find "$repo_dir/$shared_file" -user "$owner_uid" -exec chmod g+rw {} +
+  fi
+done
+
+printf '%s\n' "post_receive_permissions_reconciled" >"$repo_dir/hooks/post-receive-share.last"