Auto-sync track GitHub maintained/unmaintained topic

[iHiD]

Problem

Track repos carry a maintained / unmaintained GitHub topic. That topic (not team membership) is what drives the automated PR comments from the ping-cross-track-maintainers-team workflow, including "This is an unmaintained repository." Until now the topic was a purely manual label, fully decoupled from who's on the track's GitHub team. So a track could gain a maintainer and still greet every contributor with bots saying it's unmaintained (this is currently happening on Fortran).

Change

• Track::UpdateGithubMaintenanceStatus — reads the track repo's topics and toggles the plain maintained ↔ unmaintained pair based on whether the track has any members on its GitHub team:
  • has a maintainer + currently unmaintained → set maintained
  • no maintainers + currently maintained → set unmaintained
  • Leaves nuanced categories (wip-track, maintained-autonomous, maintained-solitary) and all other topics (e.g. community-contributions-paused) untouched. No-ops in development.
• Deferred from Github::TeamMember::Create / Destroy whenever a track-team membership actually changes (guarded on previously_new_record?), so it fires on both the real-time webhook and the SyncTeamMembersJob safety net, but not on no-op resyncs.

Notes

• This is promote-and-demote: if a track's last maintainer leaves the GitHub team, the repo flips back to unmaintained automatically.
• It triggers on the next membership change, so it does not retroactively fix repos that already have maintainers (e.g. Fortran needs a one-off manual topic fix).

Tests

New update_github_maintenance_status_test.rb (promote / demote / both no-op cases / nuanced-category protection / dev guard) plus updated Create/Destroy tests. All green.

🤖 Generated with Claude Code

[ErikSchierboom]

Before I review this, isn't this what the maintenance script is for that I've written? The main downside being that that doesn't run automatically, but it does cover all cases. Maybe that could be adapted into this script?