feat: implement skeleton phase

src/beaver_gateway/core/registry.py

@@ -0,0 +1,83 @@
+"""Agent / MCP registries + the user-facing ``Gateway`` collector.
+
+The user's ``/config/config.py`` ends with::
+
+    gateway = Gateway(agents=[...], mcps=[...], frontends=[...])
+
+``cli.main`` picks that object up and builds the registries.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from collections.abc import Iterable, Iterator
+
+    from beaver_gateway.agents.base import BaseAgent
+    from beaver_gateway.frontends.base import Frontend
+    from beaver_gateway.mcp.types import McpServerT
+
+
+class AgentRegistry:
+    """Name → agent lookup with duplicate detection."""
+
+    def __init__(self, agents: Iterable[BaseAgent]) -> None:
+        self._agents: dict[str, BaseAgent] = {}
+        for a in agents:
+            if a.name in self._agents:
+                msg = f"duplicate agent name: {a.name!r}"
+                raise ValueError(msg)
+            self._agents[a.name] = a
+
+    def __getitem__(self, name: str) -> BaseAgent:
+        return self._agents[name]
+
+    def get(self, name: str) -> BaseAgent | None:
+        return self._agents.get(name)
+
+    def __iter__(self) -> Iterator[BaseAgent]:
+        return iter(self._agents.values())
+
+    def __len__(self) -> int:
+        return len(self._agents)
+
+    def __contains__(self, name: object) -> bool:
+        return name in self._agents
+
+
+class McpRegistry:
+    """Name → MCP server lookup with duplicate detection."""
+
+    def __init__(self, mcps: Iterable[McpServerT]) -> None:
+        self._mcps: dict[str, McpServerT] = {}
+        for m in mcps:
+            if m.name in self._mcps:
+                msg = f"duplicate mcp name: {m.name!r}"
+                raise ValueError(msg)
+            self._mcps[m.name] = m
+
+    def __getitem__(self, name: str) -> McpServerT:
+        return self._mcps[name]
+
+    def get(self, name: str) -> McpServerT | None:
+        return self._mcps.get(name)
+
+    def __iter__(self) -> Iterator[McpServerT]:
+        return iter(self._mcps.values())
+
+    def __len__(self) -> int:
+        return len(self._mcps)
+
+    def __contains__(self, name: object) -> bool:
+        return name in self._mcps
+
+
+@dataclass(slots=True)
+class Gateway:
+    """Top-level object the user assembles in ``/config/config.py``."""
+
+    agents: list[BaseAgent] = field(default_factory=list)
+    mcps: list[McpServerT] = field(default_factory=list)
+    frontends: list[Frontend] = field(default_factory=list)