infra: simplify pr template

[andrewmelchor]

Summary

simplifies PR template.

[greptile-apps]

Greptile Summary

This PR strips the .github/PULL_REQUEST_TEMPLATE.md down to a single Summary section, removing the Related Issue link, AI Disclosure checklist, Type of Change checklist, Testing documentation, and the final quality Checklist.

• The removed sections served as guardrails for contributors — notably, the Related Issue section carried an explicit note that "PRs without linked issues may be closed," which is now gone along with any prompt to link issues.
• The AI Disclosure, Testing, and Checklist sections provided useful signals during review; their removal reduces the structured information available to reviewers.
• There are two trailing blank lines at the end of the file (lines 4–5) that could be cleaned up, though this is minor.
• The change is purely a process/documentation decision with no impact on code logic or runtime behavior.

Confidence Score: 5/5

• Safe to merge — this is a documentation-only change with no impact on code or runtime behavior.
• Only a markdown PR template file is modified. No logic, configuration, or executable code is touched. The change is intentional and self-consistent with the stated goal of simplification.
• No files require special attention.

Important Files Changed

Filename	Overview
.github/PULL_REQUEST_TEMPLATE.md	PR template heavily simplified — removes Related Issue, AI Disclosure, Type of Change, Testing, and Checklist sections, leaving only a Summary prompt. No code logic is affected; purely a documentation/process change.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Developer opens PR] --> B[Fill in PR Template]

    subgraph before["Before (removed sections)"]
        C[Related Issue - Closes #]
        D[AI Disclosure checklist]
        E[Type of Change checklist]
        F[How Has This Been Tested?]
        G[Checklist - guidelines, self-review, tests, docs]
    end

    subgraph after["After (remaining section)"]
        H[Summary - brief description]
    end

    B --> after

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_{Last reviewed commit: 30b086d}