docs: add focused pull request template

[messere1]

Summary

Add a pull request template that asks contributors for the information reviewers repeatedly need:

• a concise summary and related issue;
• the affected Oracle/PostgreSQL compatibility scope;
• commands actually run, including an explanation for tests not run;
• focused-change, test, documentation, formatting, and maintainability checks;
• the AI-assistance disclosure required by coding-assistants.md.

The template does not add a new gate or workflow. It provides review context while remaining easy to trim for small patches.

Testing

• rendered and reviewed the Markdown structure
• git diff --check

Closes #1973

Assisted-by: OpenAI:gpt-5

Percentage of AI-generated code: 90%

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: 13af6cb0-a8b7-4f8b-9f2a-269b98d24a27

📥 Commits

Reviewing files that changed from the base of the PR and between 481c238 and bedede1.

📒 Files selected for processing (1)

• .github/pull_request_template.md

Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

Added a pull request template with prompts for change summaries, issue links, Oracle and PostgreSQL compatibility, testing, contribution checks, and AI assistance disclosure.

Changes

Pull request template

Layer / File(s)	Summary
Template prompts .github/pull_request_template.md	Added structured prompts for change descriptions, related issues, compatibility scope, testing results, contribution checks, and AI assistance disclosure.

Priority: ⬇️ Low

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

Merge Risk: ⚪ Minimal · up to beded

This adds contributor prompts for summaries, compatibility, testing, checks, and AI disclosure without changing application or deployment behavior. No merge-readiness risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a focused pull request template.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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