fix(contracts): build hierarchical .compact tree for publish

[0xisk]

Types of changes

What types of changes does your code introduce to OpenZeppelin Midnight Contracts?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Fixes #???

PR Checklist

• I have read the Contributing Guide
• I have added tests that prove my fix is effective or that my feature works. See GUIDELINES.md#testing for more information.
• I have added documentation for new methods or changes to existing method behavior. See GUIDELINES.md#documentation for more information.
• CI Workflows Are Passing

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

Summary by CodeRabbit

Release Notes

This release contains no user-facing changes. Internal build configuration has been updated to improve the build process.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: be776fff-28a3-4888-b284-42a3fc2a81d2

📥 Commits

Reviewing files that changed from the base of the PR and between 4062968 and 768a772.

📒 Files selected for processing (1)

• contracts/package.json

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Walkthrough

The build script in contracts/package.json is updated to pass the --hierarchical flag to compact-builder, preserving all existing build command options, exclude patterns, and cleanup operations.

Changes

Build Configuration

Layer / File(s)	Summary
Build script hierarchical flag contracts/package.json	The build script adds the --hierarchical flag to the compact-builder invocation while preserving all other build command options and cleanup steps.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A flag so small, yet builds so grand,
--hierarchical now takes its stand,
In package.json's quiet line,
The builder now shall organize fine! 🐰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding a --hierarchical flag to the build script to preserve directory structure in the published package, fixing broken intra-package imports.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/hierarchical-build

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[andrew-fleming]

I was just looking into this. Good call!