feat(Agente 1): Implement FX Creator MCP Tools (T031-T035)

- Add 5 new MCP tools to server.py:
  * create_riser (T031) - Pre-drop buildup effect
  * create_downlifter (T032) - Post-drop energy release
  * create_impact (T033) - Hit, crash, sub_drop, noise impacts
  * create_silence (T034) - Break/silence effects
  * create_fx_section (T035) - Complete FX sections

- Add 5 handlers to __init__.py for Remote Script execution
- Update skill_produccion_audio.md with FX tools documentation

All tools exposed and ready for professional FX generation.

Closes Agente 1 of 20 - FX Creator implementation

mcp_server/server.py

@@ -2565,6 +2565,188 @@ def automate_filter(ctx: Context, track_index: int, start_bar: float = 0.0,
     )
 
 
+# ==================================================================
+# FASE 2.5: FX CREATOR TOOLS (T031-T035) - Exposición de arrangement_engine
+# ==================================================================
+
+@mcp.tool()
+def create_riser(ctx: Context, track_index: int, start_bar: int,
+                 duration: int = 8, intensity: float = 0.8,
+                 pitch_min: int = 36, pitch_max: int = 84) -> str:
+    """Create a riser/buildup effect (T031).
+    
+    Generates a pre-drop riser with ascending pitch and tension.
+    Perfect for build-ups before choruses or drops.
+    
+    Args:
+        track_index: Index of the target track
+        start_bar: Start bar for the riser
+        duration: Duration in bars (default 8)
+        intensity: Intensity 0.0-1.0 (default 0.8)
+        pitch_min: Minimum MIDI pitch (default 36 = C2)
+        pitch_max: Maximum MIDI pitch (default 84 = C6)
+    
+    Returns:
+        JSON with riser creation status and clip info.
+    """
+    return _proxy_ableton_command(
+        "create_riser",
+        {
+            "track_index": track_index,
+            "start_bar": start_bar,
+            "duration": duration,
+            "intensity": intensity,
+            "pitch_range": [pitch_min, pitch_max],
+        },
+        timeout=30.0,
+        defaults={
+            "track_index": track_index,
+            "start_bar": start_bar,
+            "duration": duration,
+            "intensity": intensity,
+        },
+    )
+
+
+@mcp.tool()
+def create_downlifter(ctx: Context, track_index: int, start_bar: int,
+                      duration: int = 4, intensity: float = 0.7,
+                      pitch_start: int = 72, pitch_end: int = 36) -> str:
+    """Create a downlifter effect (T032).
+    
+    Generates a post-drop downlifter with descending pitch.
+    Perfect for energy release after drops or impacts.
+    
+    Args:
+        track_index: Index of the target track
+        start_bar: Start bar for the downlifter
+        duration: Duration in bars (default 4)
+        intensity: Intensity 0.0-1.0 (default 0.7)
+        pitch_start: Starting MIDI pitch (default 72 = C5)
+        pitch_end: Ending MIDI pitch (default 36 = C2)
+    
+    Returns:
+        JSON with downlifter creation status and clip info.
+    """
+    return _proxy_ableton_command(
+        "create_downlifter",
+        {
+            "track_index": track_index,
+            "start_bar": start_bar,
+            "duration": duration,
+            "intensity": intensity,
+            "pitch_range": [pitch_start, pitch_end],
+        },
+        timeout=30.0,
+        defaults={
+            "track_index": track_index,
+            "start_bar": start_bar,
+            "duration": duration,
+            "intensity": intensity,
+        },
+    )
+
+
+@mcp.tool()
+def create_impact(ctx: Context, track_index: int, position: float,
+                  intensity: float = 1.0, impact_type: str = "hit") -> str:
+    """Create an impact FX (T033).
+    
+    Generates impact effects (hit, crash, sub drop, noise).
+    Perfect for emphasizing drops, transitions, or beats.
+    
+    Args:
+        track_index: Index of the target track
+        position: Position in bars (int) or beats (float)
+        intensity: Intensity 0.0-1.0 (default 1.0)
+        impact_type: Type of impact - "hit", "crash", "sub_drop", "noise"
+    
+    Returns:
+        JSON with impact creation status and clip info.
+    """
+    return _proxy_ableton_command(
+        "create_impact",
+        {
+            "track_index": track_index,
+            "position": position,
+            "intensity": intensity,
+            "impact_type": impact_type,
+        },
+        timeout=30.0,
+        defaults={
+            "track_index": track_index,
+            "position": position,
+            "intensity": intensity,
+            "impact_type": impact_type,
+        },
+    )
+
+
+@mcp.tool()
+def create_silence(ctx: Context, track_index: int, start_bar: int,
+                   duration: int = 1) -> str:
+    """Create silence/break effect (T034).
+    
+    Generates a moment of silence for dramatic effect.
+    Perfect for creating tension before drops.
+    
+    Args:
+        track_index: Index of the target track (for context)
+        start_bar: Start bar for the silence
+        duration: Duration in bars (default 1)
+    
+    Returns:
+        JSON with silence creation status.
+    """
+    return _proxy_ableton_command(
+        "create_silence",
+        {
+            "track_index": track_index,
+            "start_bar": start_bar,
+            "duration": duration,
+        },
+        timeout=30.0,
+        defaults={
+            "track_index": track_index,
+            "start_bar": start_bar,
+            "duration": duration,
+        },
+    )
+
+
+@mcp.tool()
+def create_fx_section(ctx: Context, section_type: str, start_bar: int,
+                      duration: int = 8, track_indices: list = None) -> str:
+    """Create complete FX section (T035).
+    
+    Generates a complete FX section with risers, impacts, and transitions.
+    
+    Args:
+        section_type: Type - "pre_drop", "post_drop", "transition", "build"
+        start_bar: Start bar for the section
+        duration: Duration in bars (default 8)
+        track_indices: List of track indices to apply FX (optional)
+    
+    Returns:
+        JSON with FX section creation status.
+    """
+    return _proxy_ableton_command(
+        "create_fx_section",
+        {
+            "section_type": section_type,
+            "start_bar": start_bar,
+            "duration": duration,
+            "track_indices": track_indices or [],
+        },
+        timeout=30.0,
+        defaults={
+            "section_type": section_type,
+            "start_bar": start_bar,
+            "duration": duration,
+        },
+    )
+
+
 # ==================================================================
 # FASE 3: INTELIGENCIA MUSICAL (T041-T060)
 # ==================================================================