feat: add monitor task infrastructure for shadow replayer comparison

[bdchatham]

Summary

• Adds monitor tasks — a third task category alongside plan tasks (sequential init) and scheduled tasks (fire-and-forget cron). Monitor tasks are submitted once in Running phase, polled each reconcile, and trigger controller reactions (Condition + Event) on completion.
• First monitor task: result-export comparison mode — the sidecar compares local block results against a canonical RPC and completes on app-hash divergence.
• Sidecar-lost-task detection: ErrNotFound after successful submission immediately marks Failed (sidecar Submit is synchronous, so not-found means the process restarted).
• ResultExportComplete Condition with reasons DivergenceDetected, TaskFailed, TaskLost for kubectl visibility and alerting.
• Removes dead scheduled-mode result-export code (CanonicalRPC is now required).
• Renames PlannedTaskStatus → TaskStatus for cross-context clarity.
• Bumps seictl to v0.0.24 (sei-protocol/seictl#44).

Test plan

• ensureMonitorTask: submit once, idempotent skip, submit error
• pollMonitorTasks: completed, failed, still running, skip completed, sidecar lost task, invalid UUID, transient error, unknown error message, empty map
• reconcileRuntimeTasks: monitor mode submission, replayer without ResultExport, poll requeue, conflict early return
• Planner: ResultExportMonitorTask returns/nil for all node types
• Conditions verified on all terminal paths
• make manifests generate — CRDs regenerated
• golangci-lint run — 0 issues
• Full test suite passes