feat(cli): speech-to-text v1 — summarize

[claude]

Closes #201

Generates a CLI recipe for speech-to-text v1 summarize feature that produces concise summaries alongside transcripts.

Summary

• Adds CLI recipe for speech-to-text v1 summarize
• Uses curl and python3 for API calls and JSON parsing
• Includes proper test validation and documentation

Test plan

• Recipe follows standard CLI format with bash script
• Uses demo audio URL and reads API key from environment
• Prints meaningful output showing both transcript and summary
• Test script validates exit code and non-empty output
• README includes key parameters and example output