fix: honor FDv1 fallback directive during initializer phase#158

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keelerm84 wants to merge 7 commits intomainfrom

mk/sdk-2288/fdv1-fallback

Commits on May 1, 2026

fix: gate FDv2 initialization on a selectorful basis
keelerm84
committed

Commits on May 6, 2026

fix: mark data system VALID once initializer chain exhausts with any applied data
keelerm84
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refactor: simplify synchronizer-phase FDv1 fallback halt path
keelerm84
committed