Squashed 'core/' content from commit 4957443

git-subtree-dir: core
git-subtree-split: 4957443184ae0eb6323635a90a19acffb3e01d07

artdag/planning/__init__.py

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+# artdag/planning - Execution plan generation
+#
+# Provides the Planning phase of the 3-phase execution model:
+# 1. ANALYZE - Extract features from inputs
+# 2. PLAN - Generate execution plan with cache IDs
+# 3. EXECUTE - Run steps with caching
+
+from .schema import (
+    ExecutionStep,
+    ExecutionPlan,
+    StepStatus,
+    StepOutput,
+    StepInput,
+    PlanInput,
+)
+from .planner import RecipePlanner, Recipe
+from .tree_reduction import TreeReducer
+
+__all__ = [
+    "ExecutionStep",
+    "ExecutionPlan",
+    "StepStatus",
+    "StepOutput",
+    "StepInput",
+    "PlanInput",
+    "RecipePlanner",
+    "Recipe",
+    "TreeReducer",
+]