feat: add Hyperliquid core primitives

[paulbalaji]

Summary

• Added Hyperliquid CoreWriter and Circle CoreDepositWallet interfaces for HyperEVM integrations.
• Added CoreWriter action encoding helpers for spot-send and send-asset payloads.
• Documented the HyperCore <> HyperEVM boundary and why these are primitives rather than a full adapter.

Validation

• forge test --match-contract HyperliquidCoreWriterTest -vvv
• pnpm -C solidity lint
• git diff --check

Follow-up

• Build production adapters separately once the UX and asset target are fixed.
• Only claim one-click user Core credit for assets with an explicit recipient-aware deposit path, currently modeled around USDC depositFor.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.37%. Comparing base (87f0933) to head (45ea845).
⚠️ Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8906      +/-   ##
==========================================
+ Coverage   79.33%   79.37%   +0.03%     
==========================================
  Files         143      144       +1     
  Lines        4278     4286       +8     
  Branches      436      436              
==========================================
+ Hits         3394     3402       +8     
  Misses        855      855              
  Partials       29       29              

Flag	Coverage Δ
solidity	80.63% <100.00%> (+0.04%)	⬆️

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Components	Coverage Δ
core	87.80% <ø> (ø)
hooks	78.11% <ø> (ø)
isms	81.46% <ø> (ø)
token	88.00% <ø> (ø)
middlewares	87.76% <ø> (ø)

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