feat: TOOL_SCHEMAS 补 confirm_bug/reject_bug/reopen_bug 三个工具 schema

bug_capability.py 已有这三个函数，但 TOOL_SCHEMAS 缺 schema，导致 PM 无法确认/驳回/重开 Bug，
bug 闭环断在 open→confirmed 第一步。补 schema 后 PM 可通过 bug_confirm_capability 拿到工具。

pipeline_service/capability_tools.py

@@ -163,6 +163,24 @@ TOOL_SCHEMAS = {
         "params": {"bug_id": "Bug ID"},
         "required": ["bug_id"],
     },
+    "confirm_bug": {
+        "module": "bug_capability",
+        "description": "确认 Bug：open → confirmed（确认缺陷有效，准备派发修复）",
+        "params": {"bug_id": "Bug ID"},
+        "required": ["bug_id"],
+    },
+    "reject_bug": {
+        "module": "bug_capability",
+        "description": "驳回 Bug：open/confirmed → rejected（附驳回原因，如误报/重复/非缺陷）",
+        "params": {"bug_id": "Bug ID", "comment": "驳回原因"},
+        "required": ["bug_id"],
+    },
+    "reopen_bug": {
+        "module": "bug_capability",
+        "description": "重开 Bug：closed/rejected → open（复测未通过或驳回后重新处理）",
+        "params": {"bug_id": "Bug ID", "comment": "重开原因(可选)"},
+        "required": ["bug_id"],
+    },
     # ── deploy_capability ──
     "configure_env": {
         "module": "deploy_capability",