Add Genaiscript podcast generator for quantifier instantiation callbacks feature

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

genaisrc/README_podcast_generator.md

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+# Quantifier Instantiation Callbacks Podcast Generator
+
+This Genaiscript generates engaging podcast scripts about Z3's quantifier instantiation callback feature added in version 4.15.3.
+
+## Usage
+
+To generate a podcast script, run:
+
+```bash
+# Default conversational style, medium duration (15-20 min)
+genaiscript run quantifier_callbacks_podcast
+
+# Educational style, short duration (5-10 min)  
+genaiscript run quantifier_callbacks_podcast --vars style=educational duration=short
+
+# Technical style, long duration (25-30 min)
+genaiscript run quantifier_callbacks_podcast --vars style=technical duration=long
+```
+
+## Parameters
+
+- **style**: `conversational` (default), `technical`, or `educational`
+  - `conversational`: Friendly, accessible tone with analogies
+  - `technical`: Precise terminology for experienced developers  
+  - `educational`: Step-by-step learning approach
+
+- **duration**: `short`, `medium` (default), or `long`
+  - `short`: 5-10 minutes of content
+  - `medium`: 15-20 minutes of content
+  - `long`: 25-30 minutes of content
+
+## Output
+
+The script generates a complete podcast episode covering:
+
+- Introduction to quantifier instantiation callbacks
+- Why this feature is important
+- Practical usage examples in Python, C++, and C
+- Advanced use cases and patterns
+- Implementation guidance
+
+## Source Material
+
+The podcast script is generated from:
+- `doc/quantifier_instantiation_callback.md` - Complete API documentation
+- `examples/python/quantifier_instantiation_callback.py` - Python examples
+- `examples/c++/quantifier_instantiation_callback.cpp` - C++ examples
+- `examples/README_quantifier_callbacks.md` - Usage guide
+
+This ensures technical accuracy and comprehensive coverage of the feature.