chore: reorganize examples and templates into examples/ by type (#54)

- Move example skills to examples/skills/
- Move scaffolding templates to examples/{agents,hands,channels,plugins,providers,integrations,skills}/
- Remove legacy skill.toml from example skills; SKILL.md is the canonical format
- Delete top-level templates/ directory

examples/skills/custom-skill-python/README.md

@@ -0,0 +1,20 @@
+# word-counter
+
+Count words, sentences, and characters in text. A minimal example of a Python runtime skill.
+
+## Configuration
+
+| Field | Value |
+|-------|-------|
+| Type | `python` |
+| Entry | `main.py` |
+
+## Input
+
+- **text** (string, required) — The text to analyze
+
+## Usage
+
+```bash
+librefang skill test ./skills/custom-skill-python --input '{"text": "Hello world. How are you?"}'
+```