Refactor API: Move automate to agent client and remove extract.schema

[MrTravisB]

Summary

• Moves automate functionality behind a new agent client (tabs.agent.automate())
• Removes extract.schema() method entirely
• Updates all documentation, examples, and tests to reflect the new API

Changes

• New Agent Client: Created Agent and AgentSync classes to handle automation
• API Simplification: Removed extract.schema() method and SchemaResponse type
• Updated Documentation: README, examples, and docstrings now reflect the new API
• Test Coverage: All 160 tests pass with 91% coverage

Migration Guide

Before

async for event in tabs.automate.execute(task="...", url="..."):
    ...

schema = await tabs.extract.schema(url="...", instructions="...")

After

async for event in tabs.agent.automate(task="...", url="..."):
    ...

# extract.schema() removed - use predefined schemas instead

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