feat: add trust scoring exploration notebook

Interactive Jupyter notebook demonstrating trust scoring, decay,
violations, and threshold gates with visualizations.

Closes #168

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: mosiddi

notebooks/README.md

@@ -0,0 +1,34 @@
+# Agent Mesh Notebooks
+
+Interactive Jupyter notebooks for exploring agent-mesh concepts.
+
+## Available Notebooks
+
+| Notebook | Description |
+|----------|-------------|
+| [trust-scoring-exploration.ipynb](trust-scoring-exploration.ipynb) | Explore the 5-dimension trust scoring system, decay, violations, and threshold gates |
+
+## Getting Started
+
+1. Install dependencies:
+
+   ```bash
+   pip install -e ".[dev]"
+   pip install jupyter matplotlib
+   ```
+
+2. Launch Jupyter:
+
+   ```bash
+   jupyter notebook notebooks/
+   ```
+
+3. Open `trust-scoring-exploration.ipynb` and run cells sequentially.
+
+## What You'll Learn
+
+- How the **RewardEngine** scores agents across 5 dimensions
+- How **trust decay** reduces scores without positive activity
+- How **policy violations** and security events impact trust
+- How **trust threshold gates** allow or deny actions
+- How to **visualize** trust score trends over time