[Feature]: don't depreciate --ai in favor of --integration .. keep both! ai is so much easier to type!

### Problem Statement

For those of us who still do some of the work ourselves instead of letting our clawed masters complete everything it's much nicer to use the --ai flag when setting up a new project. Switch the docs to --integration if you like but leave --ai for us old folks! My context window can't hold so many long words like integrashun. Thanks!

### Proposed Solution

Add --integrate but leave --ai as a relic for the OG users.

### Alternatives Considered

_No response_

### Component

Specify CLI (initialization, commands)

### AI Agent (if applicable)

None

### Use Cases

_No response_

### Acceptance Criteria

_No response_

### Additional Context

_No response_

Start at the CLI initialization command and inspect how the existing --ai and --integration options are defined and documented. Verify the intended spelling with the issue before changing it; done means initialization accepts the requested new alias while retaining --ai, and the CLI help and relevant checks reflect both options.

Written by the indexing model from the issue text.