M5: GitHub mirror PR template and seed record (ENG-269) #33

Merged demi.dev
targeting main from stoopkidddd/eng-269-github-mirror
Merged opened by and assigned to demi.dev
targeting main from stoopkidddd/eng-269-github-mirror

Linear: https://linear.app/engineereddev/issue/ENG-269

The owner approved the read-only GitHub mirror. The lead created github.com/stoopkidddd/pneumo (public; issues, wiki and projects off; topics self-hosted, pushbullet-alternative, e2e-encryption, android, pwa; homepage = Tangled). This PR adds what has to land on Tangled before the one-time seed push:

  • .github/PULL_REQUEST_TEMPLATE.md: "This is a read-only mirror. Please open pull requests on Tangled: https://tangled.org/demi.dev/pneumo" (GitHub can't turn PRs off).
  • docs/agents/tangled.md (Remotes): records the mirror's creation and settings, the one-time seed of main, and how to add the github remote. The existing rule stays: only mise run release pushes to github, and only main plus release tags.

After merge, the lead pushes Tangled main to github once so Railway has a source (ENG-271).

Verify: mise run check:infra exit 0.

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Commits 2

M5: Record that the mirror has pull requests off (ENG-269)
M5: Add the GitHub mirror PR template and record the seed (ENG-269)