chore(_example): add start:with-executor:with-openai and :with-anthropic scripts

[Scra3]

Summary

• Adds start:with-executor:with-openai — launches executor with gpt-4o via $OPENAI_API_KEY
• Adds start:with-executor:with-anthropic — launches executor with claude-sonnet-4-6 via $ANTHROPIC_API_KEY

🤖 Generated with Claude Code

Note

Add start:with-executor:with-openai and start:with-executor:with-anthropic scripts to the example package

Adds two npm scripts to package.json that use concurrently to run the local agent alongside the workflow executor CLI. Each script sources .env, sets the appropriate AI_PROVIDER, AI_MODEL, and AI_API_KEY, and waits for the agent URL to respond before starting tsx watch ../workflow-executor/src/cli.ts --pretty.

^{Macroscope summarized 2cc4048.}

[qltysh]

Coverage Impact

This PR will not change total coverage.

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