fix: fail-loud on missing evolve/diagnose templates (no silent empty)

app/harness/runner.py

@@ -2269,7 +2269,9 @@ class Runner:
 
         def _read(name: str) -> str:
             p = Path("prompts") / name
-            return p.read_text(encoding="utf-8") if p.exists() else ""
+            if not p.exists():
+                raise FileNotFoundError(f"缺进化/诊断模板: {p}（请从 TRM4 迁移或检查 prompts/）")
+            return p.read_text(encoding="utf-8")
 
         return EvolvePrompts(
             evolve_skill=_read("evolve_skill.md"),
@@ -2284,7 +2286,9 @@ class Runner:
 
         def _read(name: str) -> str:
             p = Path("prompts") / name
-            return p.read_text(encoding="utf-8") if p.exists() else ""
+            if not p.exists():
+                raise FileNotFoundError(f"缺进化/诊断模板: {p}（请从 TRM4 迁移或检查 prompts/）")
+            return p.read_text(encoding="utf-8")
 
         return DiagnosePrompts(
             defect_vs_lapse=_read("defect_vs_lapse.md"),

app/harness/video_split_cli.py

@@ -365,7 +365,9 @@ def _load_diagnose_prompts() -> Any:
 
     def _read(name: str) -> str:
         p = Path("prompts") / name
-        return p.read_text(encoding="utf-8") if p.exists() else ""
+        if not p.exists():
+            raise FileNotFoundError(f"缺进化/诊断模板: {p}（请从 TRM4 迁移或检查 prompts/）")
+        return p.read_text(encoding="utf-8")
 
     return DiagnosePrompts(
         defect_vs_lapse=_read("defect_vs_lapse.md"),