@@ -0,0 +212,4 @@
+
+        def assemble(
+            self,
+            request: ContextRequest,

@@ -0,0 +76,4 @@
+
+    def __init__(self) -> None:
+        """Initialize an empty registry."""
+        self._strategies: dict[str, ContextStrategy] = {}

@@ -0,0 +110,4 @@
+                already registered, or the strategy doesn't satisfy
+                the ``ContextStrategy`` protocol.
+        """
+        name = name or strategy.name

@@ -0,0 +183,4 @@
+        module_name, class_name = module_path.rsplit(":", 1)
+
+        try:
+            module = importlib.import_module(module_name)

@@ -0,0 +32,4 @@
+# ---------------------------------------------------------------------------
+
+
+class BackendSet(BaseModel, frozen=True):

@@ -0,0 +241,4 @@
+        default=(),
+        description="Resource types this strategy is limited to (empty = all)",
+    )
+    extra: dict[str, Any] = Field(

@@ -0,0 +52,4 @@
+        return "simple-keyword"
+
+    @property
+    def capabilities(self) -> StrategyCapabilities:

@@ -0,0 +293,4 @@
+        request: ContextRequest,
+        backends: BackendSet,
+    ) -> float:
+        if backends.graph is not None:

@@ -0,0 +350,4 @@
+        backends: BackendSet,
+    ) -> float:
+        # Works even without graph; reads from warm/cold tiers.
+        return self.capabilities.quality_score

@@ -0,0 +237,4 @@
+        ):
+            raise StrategyRegistrationError(
+                f"Module '{module_name}' is not in the allowed prefix list: "
+                f"{self._allowed_module_prefixes}. Only modules under these "