chore: remove redundant PR checklist template

[olantwin]

🤖 AI text below 🤖

The PR template contained only a checklist whose items are already enforced automatically by CI (.github/workflows/lint.yml):

• Commit message follows conventional commits → commit-check job
• Pre-commit checks pass → prek job
• CI checks pass → tautological (that is CI itself)

Since the checklist was the entire file, this removes .github/pull_request_template.md. GitHub falls back to a blank PR description box. Mirrors aegir #102.

Summary by CodeRabbit

• Documentation
  • Removed the pull request checklist for commit conventions, pre-commit validation, and CI checks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f7987835-2aa8-4bda-beaa-f92a675fdc36

📥 Commits

Reviewing files that changed from the base of the PR and between 2734dc6 and 78388bc.

📒 Files selected for processing (1)

• .github/pull_request_template.md

💤 Files with no reviewable changes (1)

• .github/pull_request_template.md

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📝 Walkthrough

Walkthrough

The pull request template removes the checklist for conventional commits, pre-commit checks, and CI checks.

Changes

Cohort / File(s)	Summary
Pull request template cleanup .github/pull_request_template.md	Removes five checklist lines from the pull request template.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 78388

This change only removes a redundant pull request checklist; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the removal of the redundant pull request checklist template.
Description check	✅ Passed	The description explains the removed template, identifies the duplicated automated checks, and states the resulting GitHub behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/remove-pr-checklist

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