Complete early roadmap foundation and calendar helpers

Docs/BasicAnimationBlueprint.md

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+# Basic Animation Blueprint
+
+The MVP player character uses the Unreal mannequin unarmed animation Blueprint:
+
+- Character Blueprint: `/Game/Agrarian/Blueprints/Characters/BP_AgrarianPlayerCharacter`
+- Skeletal mesh: `/Game/Characters/Mannequins/Meshes/SKM_Quinn_Simple`
+- Animation Blueprint: `/Game/Characters/Mannequins/Anims/Unarmed/ABP_Unarmed`
+
+This provides the first playable animation baseline for idle, walk/run
+locomotion, jump, falling, and landing. Crouch and prone currently reuse the
+same baseline presentation until the dedicated stance animation pass replaces
+them with survival-specific movement.
+
+Verification script:
+
+```text
+Scripts/verify_basic_animation_blueprint.py
+```
+
+The script validates that the Agrarian player Blueprint is still wired to the expected
+mesh and animation class, and that the required idle, blendspace, jump, fall,
+and land assets exist.