Rslib configuration harness

[ScriptedAlchemy]

Description

This PR introduces a monorepo harness for rslib, inspired by rstest's project orchestration capabilities. It enables the definition and execution of rslib build commands across multiple projects within a monorepo structure.

Key features include:

• A root rslib.harness.config.mjs for declaring project entries (paths, globs, inline configs).
• A recursive project resolver to handle nested project configurations.
• A CLI runner (scripts/rslib-harness.mjs) to execute rslib build across resolved projects.
• Support for project filtering (--project) and dry-run/list modes.
• Designed to be additive, preserving existing Nx package targets.

Related Issue

This implementation addresses the user's request to design a monorepo harness for rslib similar to rstest's capabilities, as discussed in the conversation.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have added tests to cover my changes.
• All new and existing tests passed.
• I have updated the documentation.

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commit: b46cf17

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Bundle Size Report

No bundle size changes detected.

Total dist: 6.87 MB (no change)
Total ESM gzip: 138.6 kB (no change)