Migrate a /call Integration to a Workflow

The end state:

• The code calls POST /workflows/{workflow_id}/run instead of POST /call for the migrated flow.
• Retry, re-dial, scheduling and agent-choosing logic moves out of the code and into the workflow.
• The existing call webhook handler keeps working unchanged.

Rules

• Publishing and running act on the live account, and a run places a real, billed call. Ask the user before each one.
• The first test run dials a number the user owns, never a customer's.
• Do not edit or create Bolna agents unless the user asks. This skill only creates the workflow.
• Keep the old /call path behind a flag until the user confirms the workflow works in production.

Step 1: Inventory the integration

Read the code and change nothing yet. For every place that calls /call, record: