fix(contracts): exclude yield storage layout from docgen

[kyzooghost]

This PR implements issue(s) # N/A

Summary

Excludes YieldManagerStorageLayout.sol from Solidity docgen output so docgen no longer evaluates the audited storage helper NatSpec that uses $ / $$ return variable names. This keeps audited Solidity untouched and fixes the solidity-docgen parser crash.

Verification

• cd contracts && pnpm exec hardhat docgen
• pnpm -F contracts run solidity:docgen
• pnpm -F contracts run lint:ts

Checklist

• I wrote new tests for my new core changes. N/A - tooling configuration only.
• I have successfully ran tests, style checker and build against my new changes locally.
• If this change is deployed to any environment (including Devnet), E2E test coverage exists or is included in this PR. N/A - not deployed.
• I have informed the team of any breaking changes if there are any. N/A - no breaking changes.

---

Note

Low Risk
Low risk tooling/config change that only affects generated Solidity documentation output. No contract logic or deployment behavior is modified.

Overview
Updates contracts/hardhat.config.ts to exclude yield/YieldManagerStorageLayout.sol from solidity-docgen generation, avoiding docgen processing/parsing of that audited storage-layout helper and preventing docgen crashes.

^{Reviewed by Cursor Bugbot for commit 75729f8. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

linea-besu Changelog Preview (informational)

[Unreleased] diff (commits touching linea-besu/** since latest releases/linea-besu/v* tag)

[unreleased]

🐛 Bug Fixes

• (sequencer) De-flake BundleSelectionTimeoutTest.multipleBundleSelectionTimeout (fix(sequencer): de-flake BundleSelectionTimeoutTest.multipleBundleSelectionTimeout #3051)

_{Generated by git-cliff-action using cliff.toml. This comment is informational and does not gate the PR.}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.19%. Comparing base (4f42a8a) to head (75729f8).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #3065   +/-   ##
=========================================
  Coverage     77.19%   77.19%           
  Complexity     7003     7003           
=========================================
  Files          1121     1121           
  Lines         44508    44508           
  Branches       5355     5355           
=========================================
  Hits          34356    34356           
  Misses         8785     8785           
  Partials       1367     1367           

Flag	Coverage Δ		*Carryforward flag
hardhat	96.17% <ø> (ø)
kotlin	55.86% <ø> (ø)		Carriedforward from 4f42a8a
lido-governance-monitor	97.61% <ø> (ø)		Carriedforward from 4f42a8a
linea-native-libs	90.69% <ø> (ø)		Carriedforward from 4f42a8a
linea-shared-utils	96.18% <ø> (ø)		Carriedforward from 4f42a8a
native-yield-automation-service	97.68% <ø> (ø)		Carriedforward from 4f42a8a
postman	99.92% <ø> (ø)		Carriedforward from 4f42a8a
sdk-core	98.09% <ø> (ø)		Carriedforward from 4f42a8a
sdk-ethers	89.83% <ø> (ø)		Carriedforward from 4f42a8a
sdk-viem	99.45% <ø> (ø)		Carriedforward from 4f42a8a
tracer	88.56% <ø> (ø)		Carriedforward from 4f42a8a

*This pull request uses carry forward flags. Click here to find out more.

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