Update references for the Penguin-Repository organization

[PenguinDOOM]

Summary

• replace active PenguinDOOM repository references with Penguin-Repository
• update receiver constants, trusted GitHub URLs, workflow defaults, HTTP user agents, documentation, and test fixtures
• update only the top-level vpm.json repository URL while preserving immutable historical package-version URLs

Why

The source and VPM repositories were transferred to the Penguin-Repository organization. Future release verification and yank synchronization must use the new canonical repository identity.

Validation

• Python modules compile successfully
• complete VPM receiver unittest suite passed during the migration commit
• generated __pycache__ files were removed from the PR

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

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_{TIP This summary will be updated as you push new changes.}

[Copilot]

Pull request overview

Updates the repository’s canonical organization/repo references from PenguinDOOM to Penguin-Repository to keep release verification and yank synchronization aligned with the post-transfer GitHub org identity, while intentionally preserving immutable historical package-version URLs.

Changes:

• Updated the top-level vpm.json repository URL and README instructions to use Penguin-Repository/VPM-Repository.
• Updated workflow default inputs and Python receiver constants/fixtures to trust Penguin-Repository/Pure-Base.
• Updated GitHub API/download HTTP User-Agent headers to reflect the new organization naming.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
vpm.json	Updates the top-level repo listing URL to the new Penguin-Repository org while leaving versioned URLs intact.
README.md	Updates documentation links and repo references to the new org.
.github/workflows/update-vpm.yml	Updates workflow_dispatch default source_repository to the new org.
.github/workflows/sync-vpm-yanks.yml	Updates workflow_dispatch default source_repository to the new org.
.github/tests/test_vpm_yanks.py	Updates the test fixture SOURCE_REPOSITORY constant to the new org.
.github/tests/test_vpm_receiver.py	Updates trusted GitHub URLs and payload fixture values to the new org.
.github/scripts/vpm_payload.py	Updates GitHub API User-Agent header to reflect the new org.
.github/scripts/vpm_common.py	Updates the shared SOURCE_REPOSITORY constant to the new org.
.github/scripts/vpm_archive.py	Updates release-download User-Agent header to reflect the new org.

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