feat: cherry-pick MinimalInterchainAccountRouter solidity changes

[paulbalaji]

Summary

• cherry-picked solidity-only changes from 6c715a7 (feat: MinimalInterchainAccountRouter for Igra #8323) onto audit-q2-2026
• extract AbstractInterchainAccountRouter base contract from InterchainAccountRouter
• add MinimalInterchainAccountRouter for Igra
• include updated and new tests

Notes

• MinimalInterchainAccountRouter intentionally omits commit-reveal / CCIP-read behavior and the CommitmentReadIsm sub-deployment
• CREATE2 ICA derivation is intentionally unchanged so accounts created through the full and minimal routers remain interoperable

Validation

• pnpm -C solidity test:forge --match-path test/InterchainAccountRouter.t.sol
• pnpm -C solidity test:forge --match-path test/MinimalInterchainAccountRouter.t.sol

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 549f63ef-5b98-4b4f-a749-fe9869a36dbc

📥 Commits

Reviewing files that changed from the base of the PR and between d41d088 and 92b705b.

📒 Files selected for processing (6)

• .changeset/slim-ica-core.md
• solidity/contracts/middleware/AbstractInterchainAccountRouter.sol
• solidity/contracts/middleware/InterchainAccountRouter.sol
• solidity/contracts/middleware/MinimalInterchainAccountRouter.sol
• solidity/test/InterchainAccountRouter.t.sol
• solidity/test/MinimalInterchainAccountRouter.t.sol

📝 Coding Plan

• Generate coding plan for human review comments

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[codecov]

Codecov Report

❌ Patch coverage is 93.82716% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.21%. Comparing base (d41d088) to head (92b705b).
⚠️ Report is 1 commits behind head on audit-q2-2026.

Additional details and impacted files

@@                Coverage Diff                @@
##           audit-q2-2026    #8367      +/-   ##
=================================================
+ Coverage          75.82%   77.21%   +1.39%     
=================================================
  Files                124      131       +7     
  Lines               3069     3366     +297     
  Branches             253      299      +46     
=================================================
+ Hits                2327     2599     +272     
- Misses               726      750      +24     
- Partials              16       17       +1     

Flag	Coverage Δ
solidity	78.47% <93.82%> (+1.48%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
core	87.80% <ø> (ø)
hooks	74.55% <ø> (+2.71%)	⬆️
isms	81.46% <ø> (+0.45%)	⬆️
token	86.91% <ø> (+0.28%)	⬆️
middlewares	87.87% <93.82%> (+2.89%)	⬆️

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 5 additional findings.