chore: bump Gradle wrapper to 9.6.1 and add PR template

[jamesarich]

Summary

Standards-compliance hygiene fixes (no code changes).

• Gradle wrapper 9.5.1 → 9.6.1 (§1.1): properties-only edit to gradle/wrapper/gradle-wrapper.properties — bumped distributionUrl to the 9.6.1 -bin distribution and updated distributionSha256Sum to the matching checksum. gradlew/gradlew.bat scripts untouched.
• Add .github/PULL_REQUEST_TEMPLATE.md (§8.4): summary / type of change / affirmations checklist (DCO, apiDump, build), adapted for kzstd.
• Enable Renovate vulnerabilityAlerts (§5.6) in .github/renovate.json.

Type of change

• Infrastructure / CI / build

Affirmations

• All commits are signed off (DCO).

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7dfa8f99-aef8-4f1c-8760-4e41fbafca6b

📥 Commits

Reviewing files that changed from the base of the PR and between 14c0317 and e137f3d.

📒 Files selected for processing (3)

• .github/PULL_REQUEST_TEMPLATE.md
• .github/renovate.json
• gradle/wrapper/gradle-wrapper.properties

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