refactor(mobile): share repository integration semantics

[richardsolomou]

Problem

Desktop and mobile derive repository choices through separate rules, allowing normalization, labels, selection, cache comparisons, and partial-failure behavior to drift.

Changes

Move repository option and selection semantics into portable core helpers. Mobile consumes them directly and removes its duplicate repository utility and model definitions; desktop continues using the same core integration domain.

How did you test this?

• Core test suite (2,629 tests)
• Core typecheck
• Mobile test suite (340 tests)
• Biome on changed files
• Host-boundary check

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog Code

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 9fa5d73.}