chore(main): release 0.4.0

[github-actions]

🤖 I have created a release beep boop

0.4.0 (2026-08-12)

Features

• frontend: show next app-state update instead of last update (e58ea36)

Bug Fixes

• traefik: do not report stopped apps as unroutable when traefik is missing (33fe12d), closes #880
• traefik: patch connectivity per app instead of storing stale snapshots (fe13282), closes #880
• traefik: prune orphaned proxy networks traefik was never attached to (79a5616)
• traefik: reconcile proxy network membership instead of setting it once (297ff88), closes #880
• traefik: treat a stopped load balancer as unavailable, not attached (e2c4a5d)

Documentation

• kenkeep: correct VictoriaMetrics retention to 7d (ae2df1d)
• kenkeep: record app-create wire format and client/server compat rule (b10b9d4)
• kenkeep: record app-create wire format and client/server compat rule (81270be)
• openspec: add event-driven reconciliation and connectivity indicator (87c9b3c), closes #880
• openspec: archive next-update-indicator and sync app-refresh-indicator spec (4c71955)
• openspec: archive reconcile-traefik-proxy-networks and sync its spec (2f16a69)
• openspec: cover stopped traefik in reconcile-traefik-proxy-networks (133ce18)
• openspec: propose next-update indicator for app detail (166b4e2)
• openspec: propose reconciling Traefik proxy network membership (da3e8f2), closes #880
• openspec: scope out dashboard connectivity badge (5dd2935), closes #880

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