Lab: Extension push includes macOS ._* resource fork files in archive

Description

When pushing an extension from macOS, the tar.gz archive includes macOS AppleDouble resource fork files (._* prefix) alongside every model file. When pulling the extension on Linux, the pull command rejects these as "Hidden files are not allowed in extensions."

Steps to Reproduce

On macOS, create an extension with model files in extensions/models/
Push: swamp extension push extension.yaml
On Linux, pull: swamp extension pull @namespace/extension

Actual Behavior

Pull fails with safety errors for every ._*.ts file:

"Hidden files are not allowed in extensions."

Files like ._node.ts, ._ingress.ts, ._event.ts, .__helpers.ts, etc. are present in the archive.

Expected Behavior

The push command should exclude macOS resource fork files (._*) from the archive, or the pull command should silently skip them during extraction.

Likely Cause

macOS's tar (or the archiving library used by swamp) automatically includes AppleDouble ._* files that store extended attributes and resource forks. The fix is one of:

Set COPYFILE_DISABLE=1 environment variable when creating the tar archive on macOS
Filter out files matching ._* pattern during archive creation
Filter out ._* files during pull extraction (before safety checks)

Environment

Push from: macOS (Darwin 22.6.0)
Pull on: Linux (Docker container)
swamp version: 20260227.010040.0-sha.9cd80fb4

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