feat: add validate-examples recipe for CI validation

[samueljklee]

Summary

• Add new validate-examples recipe that automates validation of all example scripts
• Discovers and runs all examples/[0-9][0-9]_*.py scripts
• Runs pytest for examples/modules/router-orchestrator/ if tests exist

Features

• skip_list parameter to skip specific examples (e.g., "12,19,20")
• example_timeout parameter (default 300s)
• cleanup parameter to remove generated files like is_prime.py
• Formatted report output with failure details
• CI-friendly exit codes (0 for pass, 1 for failure)
• Uses parse_json: true pattern for proper JSON output handling

Usage

# Run all examples
amp recipe execute recipes/validate-examples.yaml

# Skip specific examples
amp recipe execute recipes/validate-examples.yaml --context skip_list="12,19,20"

# Custom timeout
amp recipe execute recipes/validate-examples.yaml --context example_timeout="600"

Test plan

• Run recipe with default settings
• Test skip_list parameter
• Verify cleanup removes generated files
• Check CI exit codes

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