Backfill games' relational genres from IGDB metadata (Genre collection currently left empty)

[mforce]

Follow-up from @codex P2 on PR #173 (head bbf4b96), thread comment 3859937773.

When a Steam-imported game is enriched by IgdbBackfillRunner, the provider's genres still go through the
ComposeDescription workaround (which assumes games have no dedicated genre field). As a result, backfilled games
receive genre text in Description but the new relational Genres collection stays empty — so genre chips and
?genre= filtering don't reflect metadata already returned by IGDB.

Fix: update the backfill merge to resolve and attach owner-scoped genres (reusing the shared GenreResolver),
so backfilled games populate the relational Genres collection like movies/music do.

Not a blocker for PR #173; filed as fast-follow.

[mforce]

Closing per owner decision (mforce 2026-08-26): 'I did not care about existing rows, treat this as a first install.' Premise of preserving/backfilling existing rows' genre data through IGDB enrichment is moot — all deployments are treated as first install, genres are entered fresh going forward. Nothing to backfill or preserve. @codex P2 acknowledged and dismissed by owner.

[chatgpt-codex-connector]

Acknowledged. The owner’s decision makes the proposed backfill unnecessary, so no code changes, commit, or follow-up pull request were created.

Checks

• ✅ git status --short --branch — working tree is clean.

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