fix: detect default branch instead of assuming main

[c0d3ster]

Summary

• run_repo in overnight.sh hardcoded git checkout main, which fails for target repos whose default branch is master (e.g. fractaleyez) — this is why pnpm overnight fractaleyez wasn't working.
• Added a default_branch() helper that resolves origin/HEAD, falling back to checking for a local main then master branch, and errors clearly if neither exists.

Test plan

• Run pnpm overnight fractaleyez (or equivalent) against a repo whose default branch is master and confirm it checks out and pulls correctly.
• Run against a repo whose default branch is main and confirm no regression.

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📥 Commits

Reviewing files that changed from the base of the PR and between f536476 and 47da9cd.

📒 Files selected for processing (1)

• overnight.sh

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