docs(actor): add comprehensive actor YAML examples documentation
Create docs/reference/actors_examples.md with detailed examples covering:
- Simple LLM actors (code reviewers, assistants)
- Strategist actors (planning, decomposition)
- Executor actors (implementation, file operations)
- Reviewer actors (quality gates, standards compliance)
- Tool-only actors (reusable tool collections)
- Validation-node actors (linting, security scanning)
- Linear graph workflows (3-step review pipeline)
- Complex graph workflows (TDD with conditionals, retry logic)
- Hierarchical actor graphs (multi-level planning, subgraph composition)
Each example includes purpose, use cases, key features, and alignment
with CleverAgents specification. Documentation references existing
YAML files in examples/actors/ directory.
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