feat: overlay support in package loader

[n0izn0iz]

WIP - this is needed for gnopls

[Gno2D2]

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[github-actions]

This PR is stale because it has been open 3 months with no activity. Remove stale label or comment or this will be closed in 3 months.

[github-actions]

This PR is stale because it has been open 3 months with no activity. Remove stale label or comment or this will be closed in 3 months.

[thehowl]

Hey @n0izn0iz — closing in a housekeeping sweep of stale PRs; no activity since Sep 2025 and no review traction. Thanks for the work!

[note: ai-assisted]