Decommission JobSync service (#308)

## Summary

- Remove all JobSync infrastructure: ArgoCD app, k8s manifests, container build (nix), Caddy reverse proxy entry, Homepage dashboard entry, service-versions tracking, and all documentation
- Runtime teardown already completed: ArgoCD app cascade-deleted (removes deployment, PVC, service, ingress, external-secret), forge mirror deleted, 1Password item archived, local clone removed

## Motivation

Replacing JobSync with a datasette-based job tracking pipeline driven by mise tasks and a Claude agent frontend. JobSync's Next.js server actions don't expose a useful API for automation.

## Remaining manual steps after merge

- Provision Caddy to remove the stale proxy route: `mise run provision-indri -- --tags caddy`
- Sync Homepage: `argocd app sync homepage`
- Verify namespace cleanup on ringtail: `kubectl get ns jobsync --context=k3s-ringtail` (should be gone)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #308

mise-tasks/services-check

@@ -161,7 +161,6 @@ check_http "CV" "https://cv.ops.eblu.me/"
 check_http "Ntfy" "https://ntfy.ops.eblu.me/v1/health"
 check_http "Authentik" "https://authentik.ops.eblu.me/-/health/live/"
 check_http "Frigate" "https://nvr.ops.eblu.me/api/version"
-check_http "JobSync" "https://jobsync.ops.eblu.me/"
 
 echo ""
 echo "Frigate (via alerting):"