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

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+# 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?"}'
+```

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

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+---
+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`.

examples/skills/custom-skill-python/main.py

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+"""
+Word Counter Skill — a minimal example of a Python skill for LibreFang.
+
+This skill receives a text input and returns word/sentence/character counts.
+"""
+
+import re
+
+
+def run(input: dict) -> str:
+    text = input.get("text", "")
+
+    words = len(text.split())
+    sentences = len([s for s in re.split(r"[.!?]+", text.strip()) if s.strip()]) if text.strip() else 0
+    characters = len(text)
+
+    return (
+        f"Words: {words}\n"
+        f"Sentences: {sentences}\n"
+        f"Characters: {characters}"
+    )