Allow communities to configure the local talk page used by Article Guidance's "Suggest a new type" link through Community Configuration.

T433483: Redirect "suggest a new type" to per-wiki talk page with localised message template changed this link from the MediaWiki.org project page to a per-wiki talk page configured by ArticleGuidanceFeedbackTalkPage. Currently, changing that target requires a mediawiki-config deployment.

Wikis with a configured Article Guidance page:

• Arabic: https://ar.wikipedia.org/wiki/ويكيبيديا:إرشاد_المقالة
• Bengali: https://bn.wikipedia.org/wiki/উইকিপিডিয়া:নিবন্ধ_নির্দেশিকা
• French: https://fr.wikipedia.org/wiki/Projet:Aide_à_la_rédaction_d'articles
• Japanese: https://ja.wikipedia.org/wiki/Wikipedia:記事編集のガイド
• Portuguese: https://pt.wikipedia.org/wiki/Wikipédia:OrientaçõesParaArtigos
• Polish: https://pl.wikipedia.org/wiki/Wikipedia:Pomoc_redaktorska
• Simple English: https://simple.wikipedia.org/wiki/Wikipedia:Article_Guidance
• Spanish: https://es.wikipedia.org/wiki/Wikipedia:GuíadeArtículos
• Turkish: https://tr.wikipedia.org/wiki/Vikipedi:MaddeYönergesi
• Italian: https://it.wikipedia.org/wiki/Wikipedia:Guida_alla_creazione_delle_voci

These existing values should remain the defaults unless a community explicitly overrides them on-wiki.

Expected behavior

Add ArticleGuidanceFeedbackTalkPage to the existing Article Guidance Community Configuration.

• An on-wiki value controls the destination of "Suggest a new type".
• Without an on-wiki value, use the existing site-configured value.
• The configured value is a local wiki page title, not an external URL.

Implementation notes

T437586: Allow configuring redirects via Community Configuration introduced the Article Guidance Community Configuration provider in MediaWiki:ArticleGuidanceConfig.json and the dynamic-default mechanism for falling back to site configuration.

Add ArticleGuidanceFeedbackTalkPage to that provider rather than introducing a separate configuration mechanism.

Dependencies / prerequisites

Depends on the Article Guidance Community Configuration provider introduced in {T437586.}

No design, data migration, documentation, or coordinated deployment changes are expected.

Acceptance criteria

• Article Guidance Community Configuration provides an option for the feedback talk page.
• Changing it updates the destination of "Suggest a new type" without a deployment.
• With no on-wiki override, currently configured wikis keep their existing destination.
• Wikis without an existing configured feedback page retain their current behavior.
• Existing Article Guidance Community Configuration settings continue to work.

QA plan

The main regression risk is changing an existing wiki's feedback destination unintentionally.

Automated testing

Consider covering the configuration precedence:

• an on-wiki value overrides the site-configured value;
• without an on-wiki value, the site-configured value is returned.

No additional UI test is needed if existing coverage already verifies generation of the "Suggest a new type" URL.

Manual testing

Use a local wiki or Patch Demo with Article Guidance and Community Configuration enabled:

1. Set a feedback page through site configuration and leave Community Configuration unset.
   • Verify "Suggest a new type" uses the site-configured page.
2. Configure a different page through Community Configuration.
   • Verify the link uses the new page.
3. Remove the on-wiki override.
   • Verify the link returns to the site-configured page.

No production-only testing is required.