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🟡 Changes recommended

A regression spec is needed to verify that regenerating an alternate lockfile preserves OVERRIDES entries under Bundler 4.1.0.beta3, since existing specs only cover the empty case.

1 open issue

• The existing specs never create a lockfile with an OVERRIDES section, so they only exercise the… · New

What changed in this PR

Raises the minimum supported Bundler version to 4.1.0.beta3 and updates multilock’s lockfile adapter for compatibility.

Changes:

• Aligns the gem dependency, lockfile, CI, and development instructions with beta3.
• Adds override serialization to the lockfile adapter.
• Updates the RubyGems version threshold for the known bundle env failure.

File	Description
spec/​bundler/​multilock_spec.rb	Updates the bundle env compatibility threshold.
lib/​bundler/​multilock/​lockfile_generator.rb	Adds override serialization support.
Gemfile.lock	Records beta3’s dependency requirement, checksum, and Bundler version.
CLAUDE.md	Updates test instructions and compatibility notes.
bundler-multilock.gemspec	Raises the minimum Bundler dependency to beta3.
.github/​workflows/​ci.yml	Uses beta3 for tests and linting.

_{Review effort: Balanced}