Simplify agent work completion and status classification

[arjunkomath]

Summary

Implements four items from the code-simplification review, net −35 lines with three duplicated decision points collapsed to one each.

One completion protocol for agent work

Backup and restore now complete through the existing work-item result path (POST /api/v1/agent/status) instead of dedicated callback endpoints:

• WorkItemResult gains a typed output field; completion side effects for backup_volume (row update + resourceStatusChanged) and restore_volume (restore/migration events) run in completeWorkItemResults, fenced by (serverId, workId, attempt) so stale attempts can't clobber final state.
• Deleted: backup/complete, backup/failed, restore/complete routes; ReportBackupComplete/ReportBackupFailed/ReportRestoreComplete client methods; the agent's entire reportFailure callback pattern in backup.go.

Typed work-queue payloads

WorkPayloadByType maps every work type to its payload shape and enqueueWork is generic over it. This caught two real issues: a nullable storagePath could reach restore payloads (now guarded), and the autoheal payloads were untyped.

Traefik state compiled once per snapshot

CompiledTraefikState converts and hashes routing data once per expected-state snapshot (memoized by snapshot identity). Drift planning, Traefik application, and routing-sync reporting consume the same compiled snapshot, so no path can compute convergence differently.

Consolidated status classification

Replaced ~12 inline ["healthy", "running"] sets with observedReadyPhases/isObservedReady across workflows, DB queries, and dashboard components. Intentionally-different sets (rollout progress UI, serverless wake handling) left untouched.

Docs

Rewrote AGENT.md (project facts, repo map, verified commands, completed the critical-restrictions section) and symlinked CLAUDE.md to it so agents load it automatically.

Testing

• web: tsc --noEmit clean, all 290 tests pass, biome clean
• agent: go build, go vet, go test pass, gofmt clean

🤖 Generated with Claude Code

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