feat(adventure): add Lex Imperfecta

[github-actions]

create: Lex Imperfecta

Auto-synced from the challenges repo.

Source: https://github.com/off-on-dev/open-source-challenges/tree/main/adventures/planned/00-lex-imperfecta

Levels in this PR: beginner

---

Before merging

• Add contributor: block to src/data/adventures/lex-imperfecta/adventure.yaml

  contributor:
    name: "Full Name"
    url: "https://example.com"
    about: "One sentence bio."

• Confirm month: is correct for the planned release
• Set community_category_id: in src/data/adventures/lex-imperfecta/adventure.yaml (look up at https://community.offon.dev/categories.json), then run npm run generate
• Update rewards.deadline: from TODO to ISO 8601 (e.g. 2026-07-01T23:59:00+01:00)
• Review topics: on each level, auto-set to all adventure tags, refine to level-specific subset if needed
• Update community_url: in each level once the Discourse threads are created
• Update discussionUrl in each *-posts.json stub

Manual steps (only if needed)

• If any level uses an SVG architecture_diagram, add the SVG to src/assets/diagrams/ and add architecture_diagram: <file>.svg back to that level in adventure.yaml (sync strips it)
• Run node scripts/refresh-leaderboard.mjs after community_category_id is set
• Run node scripts/refresh-discussions.mjs after discussionUrl values are set

Auto-generated (do not edit by hand)

The following are kept in sync with adventure.yaml by npm run generate (prebuild hook):

• public/sitemap.xml (GENERATED:adventures region)
• react-router.config.ts prerender (GENERATED:adventures region)
• e2e/smoke.spec.ts and src/test/seo.test.ts route arrays
• src/test/prerender.test.ts pages array
• scripts/refresh-leaderboard.mjs ADVENTURE_CATEGORIES

Checks

npm run lint && npm test && npm run build && npm run test:e2e

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