resolverMarketStub did not implement the full IMarket interface —
missing GetAlphaPrice added in PR #19. This caused compile failure
in resolver tests.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Introduce a shared token symbol resolver for spot and futures lookups while keeping alpha lookup independent, restoring prefix/remap handling and preserving spot-only fallback behavior.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>