chore(deps): update MCPG_VERSION to 0.4.16

[github-actions]

Dependency Update

Updates the pinned MCPG_VERSION constant in src/compile/common.rs from 0.4.1 to 0.4.16.

Release

See the gh-aw-mcpg release notes for details.

Action Items

The upstream release notes for this version range were reviewed and were routine (internal refactors, test coverage improvements, and CI hygiene changes with no consumer-visible effect). No action items were recorded on the canonical rolling issue [deps-release-notes] mcpg — upstream release action items (issue #2040) for this range.

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