chore: remove unreachable code and dependencies

[Makyl]

Summary

This PR removes unreachable SDK, example, tooling, analytics, and test-only code identified by the ponytail audit.

The cleanup deletes 2,167 lines across 76 files and removes 11 direct dependency entries without changing the supported public SDK surface or runtime behavior.

Changes

• Remove the unreachable sponsored swap-bridge preparation path, its dedicated test, duplicate hook coverage, and stale architecture documentation.
• Remove the unused EIP-5792 EOA executor, Ankr balance client, analytics aggregation layer, and synthetic performance-baseline subsystem with their tests.
• Remove six unreferenced browser components and the orphaned tools ReportChains component.
• Remove pass-through SDK, swap, ABI, constants, and utility barrels, redirecting live imports to their concrete modules.
• Remove zero-reference helpers, constants, ABIs, internal types, and test-only wallet capability code.
• Drop unused dependencies from the root, browser example, and tools manifests, then refresh their lockfiles.

Testing

• npm run lint
• npm run lint:deps
• npm run typecheck
• npm run typecheck:tests
• npm test

Risk / Impact

• No supported public SDK method, package-root export, or runtime flow changes.
• Internal deep imports of deleted files would break, but repository-wide reachability and stale-reference scans found no remaining consumers.
• The browser example and tools packages install fewer unused dependencies.
• Tests tied exclusively to unreachable implementations were removed with those implementations; the remaining suite passes in full.

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Project	Deployment	Actions	Updated (UTC)
nexus-sdk	Ready	Preview	Jul 30, 2026 2:21pm