docs: direct contributors to use develop branch for PRs

[tcheeric]

Why now?

Clarifies which branch contributors should target with pull requests to prevent accidental merges into the wrong branch.
Related issue: #____

What changed?

• document that pull requests must target the develop branch

BREAKING

• n/a

Review focus

• wording of new contributing guideline

Checklist

• Scope ≤ 300 lines (or split/stack)
• Title is verb + object (e.g., “Refactor auth middleware to async”)
• Description links the issue and answers “why now?”
• BREAKING flagged if needed
• Tests/docs updated (if relevant)

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https://chatgpt.com/codex/tasks/task_b_68a650faea788331a45800b6b42ca8c0

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