docs: reinforce PR submission guidelines

[tcheeric]

Why now?

Ensure contributors consistently follow pull request submission guidelines and use the standard PR template.
Related issue: #0

What changed?

• Reinforced requirement in AGENTS.md to always follow PR submission guidelines and use the pull request template.

BREAKING

• None

Review focus

• Wording of the new instruction

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)

Testing

• ⚠️ mvn -q verify (fails: Docker environment not found)

Notes

• Tests require a running Docker environment.

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https://chatgpt.com/codex/tasks/task_b_68a65003a3d48331ac8198bcc1c3a65f

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