chore(adventure): add discussion URL to accessibility-nightmare beginner

[offon-data-refresh]

Add discussion URL: accessibility-nightmare / beginner

Sets the Discourse thread URL for the beginner level of accessibility-nightmare and fetches the initial set of posts.

Discussion URL: https://community.offon.dev/t/the-initial-audit-september-2026-adventure-beginner/1779

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What changed

• adventure.yaml -- community_url set on the beginner level; community_category_id set at adventure root if it was missing
• beginner-posts.json -- discussionUrl set and initial posts fetched from Discourse
• (Astro reads the YAML directly; buildAdventureCategories() in refresh-leaderboard.mjs derives the registry from adventure.yaml at runtime)

Before merging

• Verify the discussion URL is correct and the thread is publicly visible
• Check that the posts JSON contains the expected content (or is an empty array if the thread is new)
• Run npm run lint && npm run test:unit && npm run build && npm run test:e2e locally

After merging

The hourly refresh-community-data workflow will keep posts up to date automatically.

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-09-08 08:24 UTC