Changed the agent name to spec-initializer in the shape spec command

[amykhar]

Summary

Fixed what I believe is a typo in the shape-spec command.

Linked item

• Closes: # (must be an open Issue) OR
• Implements: # (must be a Discussion)
  Implements Wrong Agent called in shape-spec multi-agent command #276

Checklist

• [x ] Linked to related Issue/Discussion
• Documented steps to test (below)
• Drafted “how to use” docs (if this adds new behavior)
• Backwards compatibility considered (notes if applicable)

Documented steps to test

1. No test required. Simple typo fix

Notes for reviewers

[CasJam]

thank you!