[Deprecation] `Puppet::Util` Environment Wrapper Helpers

[silug]

Summary

Several Puppet::Util helpers are explicitly deprecated in favor of direct ENV usage.

Evidence

• lib/puppet/util.rb:44 get_env deprecated.
• lib/puppet/util.rb:51 get_environment deprecated.
• lib/puppet/util.rb:58 clear_environment deprecated.
• lib/puppet/util.rb:65 set_env deprecated.
• lib/puppet/util.rb:72 merge_environment deprecated.

Proposed OpenVox 9 Change

• Remove deprecated wrapper methods.
• Update internal callers to use ENV directly or withenv where scoped overrides are needed.

Compatibility / Risk

• Medium risk for external code importing these helpers.
• Internal migration is straightforward.

Implementation Notes

• Identify internal call sites with rg before removal.
• Keep withenv behavior if still actively used and not deprecated.
• Update developer docs that reference deprecated wrappers.

Acceptance Criteria

• Deprecated wrapper methods no longer exist in Puppet::Util.
• Internal codebase contains no calls to removed wrappers.
• Environment manipulation behavior is unchanged where supported APIs remain.

Suggested Tests

• Unit tests for environment-sensitive code paths.
• Scoped environment restoration tests around withenv.

[binford2k]

deprecated in 503c50b