Reduce restart noise further by ignoring common untracked Python cache artifacts

Constraint: Limit this checkpoint to ignore rules and handoff notes; do not change tracked artifact history
Rejected: Expand ignore coverage to all noisy data trees immediately | This pass only suppresses well-understood untracked cache noise
Confidence: high
Scope-risk: narrow
Directive: Keep ignore changes incremental and distinguish between untracked cache noise and already-tracked historical artifacts
Tested: Confirmed untracked __pycache__ and .pyc noise disappeared from git status after the ignore update
Not-tested: Did not rewrite tracking state for already-versioned cache or data artifacts

@@ -13,3 +13,8 @@
 acr-engine/.omx_wait_for_fma.log
 acr-engine/.omx_wait_for_fma.pid
 acr-engine/configs/manifests/examples/business_asset_export_real_smoke.csv
+
+# acr-engine python cache noise
+acr-engine/__pycache__/
+acr-engine/**/__pycache__/
+acr-engine/**/*.pyc

+## 2026-06-02 Python 缓存噪音忽略规则补齐 checkpoint
+
+完成项：
+- 已把以下常见未跟踪缓存噪音加入 `.gitignore`：
+  - `acr-engine/__pycache__/`
+  - `acr-engine/**/__pycache__/`
+  - `acr-engine/**/*.pyc`
+
+结论：
+- 下次续跑时，未跟踪的 Python 缓存噪音会进一步减少。
+- 已跟踪的历史产物仍会显示，这次不改动其版本管理状态。
+
 ## 2026-06-02 本地噪音忽略规则补齐 checkpoint
 
 完成项：

@@ -259,6 +259,7 @@
 - `docs/README.md` 已新增“新 session 最短可跑命令”。
 - `AGENT.md` 已同步最短可跑命令。
 - 已把本地 smoke 临时文件加入 `.gitignore`。
+- 已补充 Python 缓存噪音忽略规则。
 
 ## 第一条可跑命令（重启后先验证）