feat: AirPlan V2 — 全专家插件强制路由 + 事件系统规范化

P0-8 扩大: do_mode.py finish_worker 全专家插件强制路由
- GUI→XDB, network→NDB, C/C++→SDB, done→Rvr, blocked/failed→Dbg
- 证据去重: 已有 xdbSessions/ndbSessions/sdbReports/rvrReviewed 则跳过

P1-GAP17: 事件 emit 规范化
- 新增 7 个事件常量 (TASK_ENTERED, TASK_FINISHED, ENGINE_ENTERED 等)
- 全部 emit 调用替换字符串字面量为常量，零残留
- 30 个事件类型常量全部定义且唯一

P1-GAP18: 事件日志原子轮转
- emit 计数器每 128 次检查轮转，避免每次 emit 读文件
- 清除未使用的 _emit_with_completion/_pending_merge_complete
- 原子轮转: tempfile+os.replace 保证不损坏

eng 极端接管: 强制调用全部专家插件 (Dbg/XDB/NDB/SDB/Rvr)
commands/do.md: 更新为全专家插件路由文档

全量测试: 69 通过, 0 失败

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/air_runtime/modes/sdb_mode.py

@@ -0,0 +1,63 @@
+"""AirSDB mode — V2 静态分析器模式。
+
+多后端静态分析 (cppcheck / clang-tidy / clippy / go-vet / tsc)
+以及 diff 模式（对比两次扫描结果）。
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from air_runtime.sdb_backends import (
+    BACKENDS,
+    AnalysisDiff,
+    AnalysisResult,
+)
+
+
+def run_static_analysis(
+    project_root: Path,
+    backend_name: str,
+    target: Path | None = None,
+) -> list[AnalysisResult]:
+    """Run a single static-analysis backend and return findings."""
+    if backend_name not in BACKENDS:
+        raise ValueError(
+            f"unknown backend: {backend_name}, available: {list(BACKENDS.keys())}"
+        )
+    return BACKENDS[backend_name].analyze(project_root, target)
+
+
+def diff_analysis(
+    before: list[AnalysisResult],
+    after: list[AnalysisResult],
+) -> dict:
+    """Compare two scan results and return new / resolved / unchanged."""
+    return AnalysisDiff().diff(before, after)
+
+
+# ---------------------------------------------------------------------------
+# CLI entry point
+# ---------------------------------------------------------------------------
+
+def main(args) -> None:
+    project_root = Path(args.project).expanduser().resolve()
+    backend = getattr(args, "backend", None) or "cppcheck"
+    target = Path(args.target).expanduser().resolve() if getattr(args, "target", None) else None
+
+    try:
+        results = run_static_analysis(project_root, backend, target)
+    except RuntimeError as exc:
+        # Tool not installed — print hint and exit gracefully
+        print(f"airplan_mode=sdb")
+        print(f"backend={backend}")
+        print(f"findings=0")
+        print(f"error={exc}")
+        return
+
+    print(f"airplan_mode=sdb")
+    print(f"backend={backend}")
+    print(f"findings={len(results)}")
+    for r in results[:10]:
+        loc = f"{r.file}:{r.line}" if r.line is not None else r.file
+        print(f"{loc}: {r.severity}: {r.message}")