Rename package directory AbletonOSC/ -> ableton_osc/

Python package naming convention uses snake_case. Update the import in
the root __init__.py and the setuptools include pattern in pyproject.toml.
Internal relative imports within the package are unaffected.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ableton_osc/groove.py

@@ -0,0 +1,60 @@
+"""Handles /live/groove/* OSC addresses."""
+import logging
+from typing import Optional
+from .handler import AbletonOSCHandler
+
+logger = logging.getLogger(__name__)
+
+
+class GrooveHandler(AbletonOSCHandler):
+    def init_api(self) -> None:
+        self.clear_listeners()
+        self._add("/live/groove/get/grooves", self._get_grooves)
+        self._add("/live/groove/get/amount", self._get_groove_amount)
+        self._add("/live/groove/set/amount", self._set_groove_amount)
+
+    def _pool(self):
+        try:
+            return self.song.groove_pool
+        except Exception:
+            return None
+
+    def _get_grooves(self, params: tuple) -> Optional[tuple]:
+        pool = self._pool()
+        if pool is None:
+            return None
+        try:
+            return tuple(g.name for g in pool.grooves)
+        except Exception as e:
+            logger.warning("get grooves: %s", e)
+            return None
+
+    def _get_groove_amount(self, params: tuple) -> Optional[tuple]:
+        """params: groove_name"""
+        pool = self._pool()
+        if pool is None or not params:
+            return None
+        name = str(params[0])
+        try:
+            for g in pool.grooves:
+                if g.name == name:
+                    return (name, float(g.amount))
+        except Exception as e:
+            logger.warning("get groove amount: %s", e)
+        return None
+
+    def _set_groove_amount(self, params: tuple) -> None:
+        """params: groove_name, amount"""
+        pool = self._pool()
+        if pool is None or len(params) < 2:
+            return None
+        name = str(params[0])
+        amount = float(params[1])
+        try:
+            for g in pool.grooves:
+                if g.name == name:
+                    g.amount = amount
+                    break
+        except Exception as e:
+            logger.warning("set groove amount: %s", e)
+        return None