docs(changedetection): sync template standards

[mberlofa]

Summary

• register changedetection in the site sync playground registry
• keep the playground/site sync gate aligned with the chart validation PR

Related

• Chart PR: fix(changedetection): align template standards charts#650
• Issue: fix: align 81 charts with template standards charts#633

Validation

• make site-sync-check CHART=changedetection
• npm run lint
• npm run format:check
• npm run build
• make release-check REPO=site
• make attribution-check REPO=site

Summary by CodeRabbit

• New Features
  • Added support for the changedetection chart in the playground, so it now appears in chart selection and filtering.

[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: 63120b17-2d55-49b5-a04a-22dac909bf07

📥 Commits

Reviewing files that changed from the base of the PR and between 045d259 and 2b181d0.

📒 Files selected for processing (1)

• src/pages/playground.astro

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📝 Walkthrough

Walkthrough

This change adds a single mapping entry for the changedetection chart to the siteSyncPlaygroundConfigs object in src/pages/playground.astro, pointing it to src/data/playground-configs.ts so it is included when building configured chart slugs and filtering playground charts.

Changes

Playground Config Mapping

Layer / File(s)	Summary
Register changedetection chart config src/pages/playground.astro	Added changedetection entry to siteSyncPlaygroundConfigs mapping to src/data/playground-configs.ts.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is related to the PR, though it is broader than the actual registry update.
Description check	✅ Passed	The description covers summary, related issue, and validation, with only minor template-format gaps.
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 docs/changedetection-template-standards-sync

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