[moz] impl(§21): toolchain-templates.yaml + Issue 模板补全 + G1 修复 + §20 superseded

- config/toolchain-templates.yaml: §4 steps 模板化（7 种 business_type + ci_failure + review_result）
- src/daemon/toolchain_templates.py: 加 get_steps()/get_output_template() YAML 加载
- .gitea/ISSUE_TEMPLATE/: 补 impl.yml + docs.yml + refactor.yml
- src/daemon/toolchain_handler.py: G1 弯引号修复
- docs/design/20-issue-centric-orchestration.md: status 改为 superseded by §21

Closes #106

src/daemon/toolchain_handler.py

@@ -264,7 +264,7 @@ class ToolchainConstraintsSection:
             '| “步骤太多了，选几个做就行” | ❌ 错！必须逐条执行，不可跳过 |',
             '| “这个步骤不适用于当前情况” | ❌ 如果确实不适用，在 action report 中说明原因，但其他步骤必须执行 |',
             '| “CI/部署失败不是我代码的问题，我什么也不用做” | ❌ 错！即使是基础设施问题，你也必须创建 Issue 指派 jiangwei-infra（body 含错误来源链接 + 日志 + 判断依据），并在 action report 中说明。不能只报告“不是我的问题”就完事 |',
-            '| "文档以后再说" | ❌ 错！文档同步和代码改动在同一 PR 中完成，action report 中必须说明文档处理情况 |',
+            '| “文档以后再说” | ❌ 错！文档同步和代码改动在同一 PR 中完成，action report 中必须说明文档处理情况 |',
             "",
         ]
         return "\n".join(lines)

src/daemon/toolchain_templates.py

@@ -5,10 +5,11 @@
 
 from __future__ import annotations
 
+import json
 import logging
 from collections import defaultdict
 from pathlib import Path
-from typing import Dict
+from typing import Dict, List, Optional
 
 logger = logging.getLogger(__name__)
 
@@ -87,3 +88,64 @@ def render_template(name: str, variables: Dict[str, str]) -> str:
 def clear_cache() -> None:
     """清空模板缓存（用于测试或热更新）"""
     _template_cache.clear()
+    _steps_cache.clear()
+
+
+# ---------------------------------------------------------------------------
+# §21 §4.2 YAML steps 模板加载
+# ---------------------------------------------------------------------------
+
+STEPS_YAML_PATH = Path(__file__).parent.parent.parent / "config" / "toolchain-templates.yaml"
+
+_steps_cache: Optional[dict] = None
+
+
+def _load_steps_yaml() -> dict:
+    """加载并缓存 toolchain-templates.yaml。"""
+    global _steps_cache
+    if _steps_cache is not None:
+        return _steps_cache
+    try:
+        import yaml
+        with open(STEPS_YAML_PATH, encoding="utf-8") as f:
+            _steps_cache = yaml.safe_load(f) or {}
+        logger.debug("Loaded steps YAML: %d action_types", len(_steps_cache))
+    except FileNotFoundError:
+        logger.warning("Steps YAML not found: %s", STEPS_YAML_PATH)
+        _steps_cache = {}
+    except Exception as e:
+        logger.error("Failed to load steps YAML: %s", e)
+        _steps_cache = {}
+    return _steps_cache
+
+
+def get_steps(action_type: str, business_type: str = "") -> List[str]:
+    """从 YAML 模板配置获取 steps。
+
+    Args:
+        action_type: 动作类型（issue_assigned / ci_failure / ...）
+        business_type: 业务子类型（feature/impl/bug/docs/refactor/test/infrastructure）
+
+    Returns:
+        steps 列表，找不到返回空列表
+    """
+    templates = _load_steps_yaml()
+    section = templates.get(action_type, {})
+    if isinstance(section, dict) and business_type:
+        subsection = section.get(business_type, {})
+        return subsection.get("steps", [])
+    if isinstance(section, dict):
+        return section.get("steps", [])
+    return []
+
+
+def get_output_template(action_type: str, business_type: str = "") -> str:
+    """从 YAML 模板配置获取 output_template。"""
+    templates = _load_steps_yaml()
+    section = templates.get(action_type, {})
+    if isinstance(section, dict) and business_type:
+        subsection = section.get(business_type, {})
+        return subsection.get("output_template", "")
+    if isinstance(section, dict):
+        return section.get("output_template", "")
+    return ""