Add legal disclaimer, fix attribution, expand credits

- Add disclaimer section to README (research/education purposes)
- Remove incorrect Apache-2.0 license claim from ctrlregen docstrings
- Expand Credits with CtrlRegen and NeuralBleach attribution
- Add license info (MIT) for GeminiWatermarkTool and NeuralBleach

src/remove_ai_watermarks/noai/ctrlregen/__init__.py

@@ -8,7 +8,7 @@ and a DINOv2-based IP Adapter for semantic guidance to regenerate
 watermarked images from partially noised latents.
 
 Attribution:
-    Based on https://github.com/yepengliu/CtrlRegen (Apache-2.0).
+    Based on https://github.com/yepengliu/CtrlRegen .
 """
 
 from __future__ import annotations

src/remove_ai_watermarks/noai/ctrlregen/color.py

@@ -5,7 +5,7 @@ color shifts.  This module uses histogram-based color transfer to
 align the regenerated image's color distribution back to the original.
 
 Attribution:
-    Adapted from https://github.com/yepengliu/CtrlRegen (Apache-2.0).
+    Adapted from https://github.com/yepengliu/CtrlRegen .
 """
 
 from __future__ import annotations

src/remove_ai_watermarks/noai/ctrlregen/engine.py

@@ -5,7 +5,7 @@ canny edges) and a DINOv2-based IP Adapter (semantic control), then
 runs controllable regeneration with optional color matching.
 
 Attribution:
-    Based on https://github.com/yepengliu/CtrlRegen (Apache-2.0).
+    Based on https://github.com/yepengliu/CtrlRegen .
 """
 
 from __future__ import annotations

src/remove_ai_watermarks/noai/ctrlregen/ip_adapter.py

@@ -6,7 +6,7 @@ semantic features.  This mixin provides ``load_ctrlregen_ip_adapter``
 which handles the custom weight format and encoder swap.
 
 Attribution:
-    Adapted from https://github.com/yepengliu/CtrlRegen (Apache-2.0).
+    Adapted from https://github.com/yepengliu/CtrlRegen .
 """
 
 from __future__ import annotations

src/remove_ai_watermarks/noai/ctrlregen/pipeline.py

@@ -12,7 +12,7 @@ default implementation then uses ``hidden_states[-2]`` from DINOv2,
 which is exactly what the projection was trained on.
 
 Attribution:
-    Adapted from https://github.com/yepengliu/CtrlRegen (Apache-2.0).
+    Adapted from https://github.com/yepengliu/CtrlRegen .
 """
 
 from __future__ import annotations