feat(core,backends,frontends,storage): conversations, inject queue, session pool, gateway mcp tools, api frontend

src/beaver_gateway/agents/claude.py

@@ -42,15 +42,27 @@ class ClaudeOptions(BaseModel):
     """Extra inherited variable names to let through the env whitelist."""
 
     max_turns: int | None = None
-    idle_session_ttl: float = 1800.0
-    """Seconds a live session may sit unused before it is closed."""
-
-    session_store_flush: str = "batched"
+    session_store_flush: str = "eager"
+    """``eager`` mirrors every transcript frame as it lands, so a gateway
+    killed mid-turn loses at most the frame in flight."""
 
 
 class ClaudeAgent(BaseAgent):
     cwd: Path
     system_prompt: str = ""
     prompt_sources: tuple[PromptSource, ...] = ()
+    prompt_sources_by_kind: Mapping[str, tuple[PromptSource, ...]] = Field(
+        default_factory=dict
+    )
+    """Per conversation kind (``master``/``branch``/``deep``/``job``/``fork``)
+    assembly; falls back to ``prompt_sources``. Constant per kind (§3.12)."""
+
     skill_sets: tuple[Path, ...] = ()
+    gateway_tools: tuple[str, ...] = ()
+    """Gateway tools exposed in-process (``read_conversation``, ``spawn``,
+    ``say``, ``schedule``, ``inject``); empty = no gateway MCP server."""
+
     options: ClaudeOptions = Field(default_factory=ClaudeOptions)
+
+    def prompt_for(self, kind: str) -> tuple[PromptSource, ...]:
+        return self.prompt_sources_by_kind.get(kind, self.prompt_sources)