* Improve tmux statusline: sort rigs by activity and add visual grouping
- Sort rigs by running state, then polecat count, then operational state
- Add visual grouping with | separators between state groups
- Show process state with icons (🟢 both running, 🟡 one running, 🅿️ parked, 🛑 docked, ⚫ idle)
- Display polecat counts for active rigs
- Improve icon spacing: 2 spaces after Park emoji, 1 space for others
* Fix golangci-lint warnings
- Check error return from os.Setenv
- Check error return from lock.Unlock
- Mark intentionally unused parameters with _
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Co-authored-by: joshuavial <git@codewithjv.com>
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