将 workspace 缓存失效机制切换到 revision token，并补齐回归验证。

通过 revision 驱动 prompt/prebuild 缓存重建，避免请求路径上的目录签名扫描成本，同时新增缓存失效与路径约定相关测试，确保行为稳定。

Made-with: Cursor

tests/test_oclaw_system_prompt.py

@@ -127,3 +127,63 @@ def test_executor_static_prompt_cache_invalidates_on_settings_change(monkeypatch
         skill_binding_role="generalist",
     )
     assert calls["n"] == 2
+
+
+def test_executor_static_prompt_cache_invalidates_on_workspace_revision_change(monkeypatch: pytest.MonkeyPatch) -> None:
+    from oclaw.runtime import system_prompt as sp
+
+    class DummyStore:
+        def get_setting(self, key: str) -> str:
+            _ = key
+            return ""
+
+    class DummyReg:
+        pass
+
+    calls = {"n": 0}
+    token = {"v": 1}
+
+    def _skills_block(**kwargs) -> str:
+        _ = kwargs
+        calls["n"] += 1
+        return "skills-block"
+
+    monkeypatch.setattr(sp, "expert_workspace_signature_token", lambda: ("revision", token["v"]))
+    monkeypatch.setattr(sp, "build_project_context_block", lambda **kwargs: "")
+    monkeypatch.setattr(sp, "build_skills_catalog_block", _skills_block)
+    monkeypatch.setattr(
+        sp,
+        "render_runtime_prompt",
+        lambda prompt_id, variables, strict: f"{prompt_id}\n{variables.get('skills_catalog') or ''}",
+    )
+
+    store = DummyStore()
+    reg = DummyReg()
+    _ = sp.get_executor_prompt_static(
+        store=store,
+        tools=reg,  # type: ignore[arg-type]
+        base_url="",
+        base_system="base",
+        workspace_dir=None,
+        skill_binding_role="generalist",
+    )
+    _ = sp.get_executor_prompt_static(
+        store=store,
+        tools=reg,  # type: ignore[arg-type]
+        base_url="",
+        base_system="base",
+        workspace_dir=None,
+        skill_binding_role="generalist",
+    )
+    assert calls["n"] == 1
+
+    token["v"] = 2
+    _ = sp.get_executor_prompt_static(
+        store=store,
+        tools=reg,  # type: ignore[arg-type]
+        base_url="",
+        base_system="base",
+        workspace_dir=None,
+        skill_binding_role="generalist",
+    )
+    assert calls["n"] == 2