Add market cache and HIP-4 outcome support

[InTheta]

Summary

• add market-cache utilities for Hyperliquid metadata, builder DEXs, and HIP-4 outcome routing
• expose HIP-4 outcome market lookup helpers, asset IDs, token names, and allMids overlays
• add docs, tests, transport improvements, and npm release helper workflow updates used by the fork

Validation

• scanned branch diff for env files, private keys, wallet material, and secret-like patterns
• deno task check
• deno test tests/utils/marketCache.test.ts
• live non-trading mainnet checks for outcomeMeta and allMids #... entries

[nktkas]

Thanks for the PR, but it mixes too many unrelated things in one diff, and most of them either already exist or don't belong in the SDK:

• HyperliquidMarketCache — this is a large application-level layer on top of a low-level SDK, and it partially duplicates existing code (tick/lot math from _format.ts, SymbolConverter, etc.). The maintenance surface is too big for what it adds.
• HIP-4 outcome support — already added in d634739.
• HTTP rate limiting (TokenBucketRateLimiter, rateLimit) — I think this belongs either in the application layer, or in a dedicated transport wrapper that fully implements the documented rate limits — not a partial token bucket inside HttpTransport.
• SymbolConverter auto-refresh — refresh scheduling belongs on the application side as well.
• allMids dex filter — not needed, the current check is correct: the main feed omits dex, it doesn't send "".
• npm release scripts/workflows, @intheta/hyperliquid, docs/omni-fork-release.md — these are specific to your fork and don't belong upstream.

The WebSocket keep-alive pong timeout is a good change, but it should come as a separate PR.

Closing — too broad to merge as-is.