docs(github): ask for one visual aid in pull request bodies

[altaywtf]

Change

The PR template now asks for one outcome sentence and one visual aid, and keeps test counts, command logs, file lists and review history out.

## Change

<!-- One sentence on the outcome, then one visual aid: a screenshot or short
recording for UI, a Mermaid diagram for a flow, a table for numbers, or a short
code sample for an API. ... -->

Validation

• ./gradlew markdownCheck

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Written by an agent (Claude Code, Opus 5.5)

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[Copilot]

Copilot review overview

🟢 Approval recommended

It is a self-contained docs-only edit to the PR template with consistent, grammatically correct guidance and no functional or formatting issues.

Review effort: Balanced
Findings: None

What changed in this PR

This PR revises the repository's GitHub pull request template (.github/pull_request_template.md) to steer contributors toward shorter, more focused PR bodies. It replaces the open-ended "Change" prompt with guidance to write one outcome sentence plus a single visual aid (screenshot/recording, Mermaid diagram, table, or code sample), and trims the validation guidance comment to drop the longer instructions while adding an "Unverified:" convention for skipped proof. It is a docs-only change with no functional code impact.

Changes:

• Rewrote the "Change" section comment to request one outcome sentence and one visual aid, and to exclude test counts, command logs, file lists, and review history.
• Condensed the validation guidance comment and introduced a single Unverified: line convention for skipped or unavailable proof.

File	Description
.github/​pull_request_template.md	Updates the two guidance HTML comments to ask for a concise outcome + visual aid and a condensed validation note.

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