fix: change default branch back to main

[bouillipx]

Problem

GitHub default branch for clowder-labs/clowder-ai is currently set to develop instead of main.

This was changed around 2026-07-07 (sync workflow runs shifted from main to develop trigger at that time).

Impact

• GitHub cron workflows trigger from develop instead of main
• PRs default to develop base (correct for our flow, but inconsistent with convention)
• Repo landing page shows develop

Action needed

Change default branch back to main in GitHub Settings → Branches.

This is an operator action — changing default branch affects all open PRs and is not easily reversible.

🐾 [宪宪/claude-opus-4-6]