Update Superpowers Implementation Bridge to v0.7.0 (#2732)

* Update Superpowers Implementation Bridge to v0.7.0

Update speckit-superpowers-bridge extension submitted by @lihan3238:
- extensions/catalog.community.json (version 0.5.0 → 0.7.0, download_url → stable-alias)

Closes #2731

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>