- Define ContextStrategy protocol with select_context(index, budget, scope) method
- Implement StrategyRegistry class for managing context strategies
- Add entry-point-based strategy discovery mechanism
- Support automatic registration of built-in strategies
- Add comprehensive BDD tests for protocol and registry functionality
- Full type annotations with pyright compliance

@@ -0,0 +18,4 @@
+    context.protocol = ContextStrategy
+
+
+@then("the protocol has a select_context method")

@@ -0,0 +12,4 @@
+    "ContextStrategy",
+    "StrategyRegistry",
+    "get_registry",
+]

@@ -0,0 +9,4 @@
+class ContextStrategy(Protocol):
+    """Protocol for context selection strategies.
+
+    A context strategy is responsible for selecting relevant context

@@ -0,0 +19,4 @@
+        """Initialize the strategy registry."""
+        self._strategies: dict[str, Any] = {}
+        self._loaded: bool = False
+

@@ -0,0 +12,4 @@
+  # ---------------------------------------------------------------------------
+
+  @protocol_compliance
+  Scenario: Every built-in strategy satisfies the ContextStrategy protocol

@@ -0,0 +28,4 @@
+  # ---------------------------------------------------------------------------
+
+  @can_handle_contract
+  Scenario: can_handle returns float in range [0.0, 1.0] for all strategies

@@ -0,0 +2,4 @@
+
+from __future__ import annotations
+
+from behave import given, then, when

@@ -0,0 +32,4 @@
+# ---------------------------------------------------------------------------
+
+
+@given("all built-in strategies are instantiated")

@@ -0,0 +37,4 @@
+    context.strategies = _all_builtins()
+
+
+@given("a default ContextRequest")

@@ -0,0 +42,4 @@
+    context.request = ContextRequest(query="test query")
+
+
+@given("a BackendSet with text backend only")

@@ -0,0 +59,4 @@
+# ---------------------------------------------------------------------------
+
+
+@then("every strategy should satisfy the ContextStrategy protocol")

@@ -0,0 +97,4 @@
+    )
+
+
+@then("every strategy should return a non-empty explain string")

@@ -8,0 +11,4 @@
+- **ContextStrategy Protocol and Plugin Registration System** (#10590): Implemented the
+  ``ContextStrategy`` protocol for pluggable context assembly strategies within the ACMS.
+  Includes six built-in strategy implementations: ``SimpleKeywordStrategy`` (keyword matching,
+  quality 0.3), ``SemanticEmbeddingStrategy`` (word-overlap similarity search, quality 0.6),

@@ -8,0 +11,4 @@
+- **ContextStrategy Protocol and Plugin Registration System** (#10590): Implemented the
+  ``ContextStrategy`` protocol for pluggable context assembly strategies within the ACMS.
+  Includes six built-in strategy implementations: ``SimpleKeywordStrategy`` (keyword matching,
+  quality 0.3), ``SemanticEmbeddingStrategy`` (word-overlap similarity search, quality 0.6),