[plainprogrammer]

What changed

Every page now ends with a footer carrying Wizards of the Coast's Fan Content Policy notice and the Scryfall attribution. Until now the app had no unofficial-content notice anywhere, and its only attribution was one line on the card page, while the collection, search results and the scanner showed card images with none. Research 016 lists both as gaps for any instance, and ruling 28 asked for this footer.

• The wording belongs to the Magic catalog. A catalog source may supply its lines through a new optional hook, .content_notice; MTG::Scryfall::Source supplies the policy's notice (word for word, with "Collector" as the title) and "Card data and images provided by Scryfall." The core (Catalog::ContentNotice, the layout, the layouts/footer partial) names no collectible, source or rights holder, and spec/footer_core_spec.rb guards that (ADR 0018, updated here).
• Links, no logo. "Fan Content Policy" links to Wizards' policy page and "Scryfall" to scryfall.com, in the same tab. A line is plain text plus the phrases that link out; a link is rendered only for an absolute https address on a phrase that occurs exactly once. The footer holds text and links only.
• One place, every page. The application layout renders it after the page's main content, so pages do nothing to get it. The card page's own attribution line is removed. Requests answered without the layout (a Turbo-Frame request, a Turbo Stream, the health check) carry none.
• Phones. The footer scrolls with the content and its last line stops above the fixed tab bar. The layout marks the shell c-shell--footed and the footer takes the bar's clearance from c-main, so there is no empty band before it.
• Scanner pages. The footer needs no script or inline style, and the scanner's Content-Security-Policy is unchanged.
• Design system. A new Footer pattern: its own block at the end of collector/additions.css, docs/design-system/components/Footer.md, and a README line.

Documents

• Spec: spec.md (v1.2.1, approved, reviewed twice)
• Plan: plan.md (approved with one change: a body class in place of a :has() selector)
• Verification: verification.md

Verification

bin/ci passes: RuboCop, Brakeman, bundler-audit, importmap audit and RSpec with 1178 examples, 0 failures, 1 pending (the art-agreement check, which needs a local cache and is unrelated). Every acceptance criterion (AC-1.1 to AC-4.4) is met by a passing example; the table is in the verification document. A read-only implementation review found the code spec-aligned and identical to the plan.

Not covered by an example: a Turbo morph refresh, touch targets, and following a footer link from the scanner mid-sitting. The "runs no query" example counts queries at the model, not around a page render.

Owed from the maintainer

On a real phone, since headless Firefox has no safe-area inset and no touch:

• Scroll a page with the tab bar to its end: the footer's last line stops above the bar, with the home indicator clear.
• Tap both footer links: each opens in the same tab, and Back returns to the page.
• With a card added to the sitting, follow a footer link from /scanner and come back: the camera starts again and the sitting still lists the card.

Expected conflicts with the spec 019 PR (issue #35, uncropped card images)

Both branches add adjacent lines in the same places. Keep both sides in each:

• the end of app/assets/stylesheets/collector/additions.css (each appends its own block);
• docs/design-system/README.md, after the spec 015 "App additions" line;
• the pattern list in spec/design_system_files_spec.rb;
• possibly the RSpec/DescribeClass list in .rubocop.yml.

This PR removes one line inside the card page's block of additions.css (.c-attribution) and one line of catalog/entries/show.html.erb; it touches no image rule.

Screenshots

From test data, so the cards show their names on blank cards. Phone shots are a 390 × 844 frame scrolled to the end of the page.

Sign-in, 1280px	Card page end, 1280px

Card page, 390px	Scanner, 390px	Collection, 390px, dark

Closes #34

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