docs: record the icon artwork sourcing decision

[avandenberghe]

Bookkeeping only — no code or asset changes. Follows #392, which left "how does the remaining artwork get sourced" as an open question.

Decision: community wikis, with attribution. Alternatives considered: commissioning an artist (~168 pieces across 9 visual styles), extracting from game clients, or closing the artwork tickets and relying on #389's fallback chain.

What the new section records

The scale: ~168 assets — bbguildlineage2 122, bbguildffxi 26, bbguildffxiv 10, bbguildlotro 5, bbguildeq2 2, bbguildgw2 2, bbguildswtor 1, plus the 9 <game>_unknown.png (#391). GW2's render service and XIVAPI are exhausted; nothing upstream covers the rest.

And the part that matters most — a wiki is a discovery route, not a licence. A class icon on a fan wiki is almost always the publisher's copyrighted game asset, and the wiki's CC-BY-SA text licence does not extend to it. So each batch, before anything is pulled:

1. Check the publisher's fan-content policy — the actual basis on which a fan extension ships game art, and not new ground here since the plugins already ship publisher-owned icons
2. Check the wiki's own image terms, which are often narrower than its text licence
3. Record provenance in a per-plugin contrib/ATTRIBUTION.md: wiki, owning publisher, policy relied on. These repos are GPL-2.0, so third-party art that isn't GPL-compatible has to be identifiable rather than implied to be covered by the repo licence
4. Prefer authored placeholders where provenance is unclear — and for Every game plugin is missing its <game>_unknown.png fallback icon #391 regardless, since no wiki has a "generic unknown class" icon

Candidate sources are listed per game as candidates to verify, deliberately not as settled licensing claims.

Also

Next steps item 3 now sequences the work smallest-set-first (<game>_unknown.png → swtor/eq2/gw2/lotro/ffxiv → ffxi → lineage2 last) instead of restating the question, and notes that the dimension and coverage tests added 2026-09-24 already pin sizes and filenames — so a batch that lands mis-sized or misnamed fails CI instead of shipping crooked.

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[codecov]

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