Refactor and improve documentation, add examples

examples/README.md

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+# Fence Examples
+
+Runnable examples demonstrating `fence` capabilities.
+
+If you're looking for copy/paste configs and "cookbook" workflows, also see:
+
+- Config templates: [`docs/templates/`](../docs/templates/)
+- Recipes for common workflows: [`docs/recipes/`](../docs/recipes/)
+
+## Examples
+
+| Example | What it demonstrates | How to run |
+|--------|-----------------------|------------|
+| **[01-dev-server](01-dev-server/README.md)** | Running a dev server in the sandbox, controlling **external domains** vs **localhost outbound** (Redis), and exposing an inbound port (`-p`) | `cd examples/01-dev-server && fence -p 3000 --settings fence-external-blocked.json npm start` |
+| **[02-filesystem](02-filesystem/README.md)** | Filesystem controls: `allowWrite`, `denyWrite`, `denyRead` | `cd examples/02-filesystem && fence --settings fence.json python demo.py` |