Bug Description

Spec Kit supports AGY/Antigravity in specify init, but specify extension add does not register extension commands into .agent/workflows. The extension installs successfully, yet no new command files appear.

Steps to Reproduce

1. Create a Spec Kit project for AGY / Antigravity
2. Install an extension:
   specify extension add --dev /path/to/extension
3. Check .agent/workflows.

Expected Behavior

Extension commands are written to .agent/workflows (e.g., speckit..*.md).

Actual Behavior

No new command files appear in .agent/workflows.

Specify CLI Version

0.1.6

AI Agent

Antigravity

Operating System

mac0S v26.3

Python Version

python 3.12.1

Error Logs

NA

Additional Context

No response

Solution

PR: fix: extension command registration with agy/Antigravity