fix: switch to bun publish for npm release

[rsbh]

Summary

• Replace npm publish with bun publish to fix Cannot read properties of null (reading 'matches') error
• Add files field to packages/chronicle/package.json to explicitly scope published contents
• Remove unnecessary .npmrc creation step; bun publish uses NPM_CONFIG_TOKEN env var directly

Test plan

• Verified with bun publish --dry-run locally (117 files, 0.48MB)
• Trigger a release to verify end-to-end publish

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 915fe516-63d7-4acb-9f72-002a6b405b5b

📥 Commits

Reviewing files that changed from the base of the PR and between ad5b7f9 and 60fdc89.

📒 Files selected for processing (2)

• .github/workflows/release.yml
• packages/chronicle/package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat_npm_publish

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