diff --git a/.dockerignore b/.dockerignore
index 6c1161b7..cfde6de8 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -3,12 +3,14 @@
 .gitignore
 
 # Python
-__pycache__
-*.pyc
-*.pyo
+**/__pycache__/
+**/*.pyc
+**/*.pyo
+**/.pytest_cache/
 venv/
 .venv/
-*.egg-info/
+**/*.egg-info/
+packages/*/build/
 
 # Node
 node_modules/
@@ -31,6 +33,7 @@ static/
 
 # Docs
 .claude/
+.docs/
 docs/
 *.md
 !README.md
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 508f48b4..3bcde962 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -121,8 +121,9 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           build-args: |
             VERSION=${{ steps.vars.outputs.version }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+          # 固定 registry 引用，让不同发布 tag 复用包含中间 builder 的缓存。
+          cache-from: type=registry,ref=${{ env.IMAGE_NAME }}:buildcache
+          cache-to: type=registry,ref=${{ env.IMAGE_NAME }}:buildcache,mode=max
 
       - name: Generate release notes (tag push only)
         if: ${{ github.event_name == 'push' }}
diff --git a/Dockerfile b/Dockerfile
index 21961a37..ce3295d4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,8 @@
 # 多阶段构建，减小最终镜像大小
 
 # ===== Stage 1: 前端构建 =====
-FROM node:24.14.0-alpine AS frontend-builder
+# 静态资源与目标架构无关，使用构建机原生平台，避免 ARM 镜像构建时通过 QEMU 跑 pnpm。
+FROM --platform=$BUILDPLATFORM node:24.14.0-alpine AS frontend-builder
 
 WORKDIR /app/frontend
 
@@ -42,9 +43,6 @@ RUN sed 's/^-e //' requirements-runtime.txt > /tmp/requirements-runtime.txt \
 # ===== Stage 3: Python 运行环境 =====
 FROM python:3.11-slim-bookworm
 
-# 版本号（构建时传入）
-ARG VERSION=dev
-
 WORKDIR /app
 
 # 安装系统依赖
@@ -98,7 +96,8 @@ COPY src/ ./src/
 COPY server.py ./
 COPY prompts/ ./prompts/
 
-# 写入版本号
+# 写入版本号；延后声明，避免换版本号时让系统依赖安装缓存失效。
+ARG VERSION=dev
 RUN echo "${VERSION}" > VERSION
 
 # 从前端构建阶段复制静态文件
diff --git a/tests/test_assistant_task_runner.py b/tests/test_assistant_task_runner.py
index 53419ea4..e1e74728 100644
--- a/tests/test_assistant_task_runner.py
+++ b/tests/test_assistant_task_runner.py
@@ -213,11 +213,10 @@ def complete_task_with_message(self, task_id, conversation_id, content):
 
     async def run():
         runner.start_message(task_id, conversation_id)
-        for _ in range(20):
-            if repository.get_task_snapshot(task_id)["status"] == "completed":
-                return
-            await asyncio.sleep(0.01)
-        raise AssertionError("runner did not finish")
+        # Wait for the worker before reading the shared in-memory SQLite connection.
+        async with asyncio.timeout(5):
+            while runner.is_running(task_id):
+                await asyncio.sleep(0.01)
 
     asyncio.run(run())
     events = repository.list_task_events(task_id, after_sequence=2)