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/SKILL.md

@@ -0,0 +1,11 @@
+---
+name: word-counter
+description: Count words, sentences, and characters in text.
+---
+
+# Word Counter
+
+Counts words, sentences, and characters in the provided text.
+
+The prompt body is unused for this skill — execution is delegated to
+`main.py` via the `python` runtime declared in `skill.toml`.