fix(backends,storage,core): setuid in exec wrapper, missing-column migration, runner config dir for mirror, tagged prompt sources

src/beaver_gateway/agents/claude.py

@@ -1,8 +1,9 @@
 """Claude agent definition, backed by the Claude Agent SDK.
 
 The system prompt is either ``system_prompt`` verbatim or, when
-``prompt_sources`` is set, the concatenation of those files assembled at
-every session spawn (see ``core/prompt.py``). ``skill_sets`` are
+``prompt_sources`` is set, the concatenation of those files (or
+``(tag, file)`` pairs) assembled at every session spawn (see
+``core/prompt.py``). ``skill_sets`` are
 directories of ``<skill>/SKILL.md`` folders; each becomes a local SDK
 plugin. Nothing from disk is loaded otherwise: the adapter runs with
 ``setting_sources=[]``.
@@ -16,6 +17,7 @@ from pathlib import Path  # noqa: TC003 - pydantic runtime
 from pydantic import BaseModel, ConfigDict, Field
 
 from beaver_gateway.agents.base import BaseAgent
+from beaver_gateway.core.prompt import PromptSource  # noqa: TC001 - pydantic runtime
 
 __all__ = ["ClaudeAgent", "ClaudeOptions"]
 
@@ -49,6 +51,6 @@ class ClaudeOptions(BaseModel):
 class ClaudeAgent(BaseAgent):
     cwd: Path
     system_prompt: str = ""
-    prompt_sources: tuple[Path, ...] = ()
+    prompt_sources: tuple[PromptSource, ...] = ()
     skill_sets: tuple[Path, ...] = ()
     options: ClaudeOptions = Field(default_factory=ClaudeOptions)