[FEAT] Add SkillOrchestra: skill-aware agent routing via skill transfer

[Steve-Dusty]

Summary

• Implements SkillOrchestra class based on the paper "SkillOrchestra: Learning to Route Agents via Skill Transfer"
• Routes tasks to agents by maintaining a Skill Handbook that profiles each agent on fine-grained skills, infers task skill requirements via LLM, and scores agents via weighted competence-cost matching
• Auto-generates skill profiles from agent descriptions, with optional EMA-based learning from execution feedback

Changes

• New file: swarms/structs/skill_orchestra.py — Full implementation with 8 Pydantic models, 3 prompt templates, and the SkillOrchestra class
• Modified: swarms/structs/__init__.py — Added export

Test plan

• Verify import: from swarms import SkillOrchestra
• Create 3+ agents with distinct descriptions, run SkillOrchestra(agents=...).run("task") and verify correct agent selection
• Test top_k_agents=2 for multi-agent concurrent execution
• Test learning_enabled=True across multiple runs to verify profile updates
• Run existing test suite to verify no regressions

Closes #1404

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📚 Documentation preview 📚: https://swarms--1442.org.readthedocs.build/en/1442/