docs: Document scope-based session management features

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Documents the new scope-based session management features from PR #150 in doc-detective/common:

• scope property: Added to runShell, runCode, and type actions for persistent terminal/code sessions that can be reused across multiple test steps
• waitUntil property: Added to runShell and runCode actions to wait for specific patterns in stdout/stderr before completing the step
• terminateScope action: New action for properly terminating scoped processes with graceful shutdown (SIGTERM) and forced termination (SIGKILL)

Each feature includes comprehensive documentation, examples, and schema references. All scope names are validated with the pattern ^[a-zA-Z0-9_-]{1,64}$ and the features maintain full backward compatibility.

Trigger Events

• doc-detective/common PR #150: feat: add scope-based session management

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