feat: add zetachain chain export path

[fadeev]

Summary

Add the ./chains/zetachain export entry to package.json, allowing consumers to import zetachain-specific modules via @zetachain/toolkit/chains/zetachain.

Also adds CLAUDE.md with project conventions.

Integration

Import zetachain modules directly:

import { ... } from "@zetachain/toolkit/chains/zetachain";

Breaking Changes

None.

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Note

Low Risk
Low risk: adds a new package.json export path and a contributor guidelines doc, with no runtime logic changes. Main risk is packaging/build breakage if the referenced dist/.../chains/zetachain outputs are missing or misnamed.

Overview
Adds a new package.json exports entry for ./chains/zetachain, enabling consumers to import @zetachain/toolkit/chains/zetachain with proper ESM/CJS and type resolution.

Also introduces CLAUDE.md documenting project conventions for branch naming and PR creation.

^{Written by Cursor Bugbot for commit fa3da5a. Configure here.}

Summary by CodeRabbit

• New Features
  • Added zetachain module to public exports, making it available for use in the package.

[coderabbitai]

📝 Walkthrough

Walkthrough

The PR introduces a new CLAUDE.md file documenting Claude Code workflow guidelines for pull requests and branch naming, and adds a new public export entry for the zetachain module in package.json following existing export patterns.

Changes

Cohort / File(s)	Summary
Development Guidelines CLAUDE.md	New file documenting Claude Code workflow conventions, including semantic pull request titles, branch naming strategies using git diff analysis, and formatting requirements.
Package Configuration package.json	Added public export entry for the zetachain module with types, ESM, and CommonJS entry point mappings, mirroring the structure of existing chain exports.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: add zetachain chain export path' directly and specifically describes the main change in the changeset: adding a new zetachain export entry to package.json.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/add-zetachain-export

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