docs(cron): recommend lighter models for routine automation jobs (#125000)

The cron model picker help and the automations docs now say what
operators otherwise learn by surprise on the bill: summaries, triage,
and classification jobs run well on a lighter model, and --fallbacks
covers escalation. Copy-only change; pnpm ui:i18n:verify green, no
baseline drift.

docs/automation/cron-jobs.md

@@ -221,6 +221,12 @@ until their tool policy is explicitly edited or the job is recreated.
 
 `--model` sets the job's primary model; it does not replace a session `/model` override, so configured fallback chains still apply on top of it. An unresolved or disallowed model fails the run with an explicit validation error rather than silently falling back to the default. If a job has `--model` but no explicit or configured fallback list, OpenClaw passes an empty fallback override instead of silently appending the agent primary as a hidden retry target.
 
+Pick the model for the job's difficulty, not the agent's default. Routine
+automation - summaries, triage, classification, status checks - runs well on a
+lighter model, which is cheaper and faster per run and adds up across a
+schedule. Keep your default model for jobs that need deep reasoning, and use
+`--fallbacks` when a light primary should escalate on failure.
+
 Model-selection precedence for isolated jobs, highest first:
 
 1. Per-job payload `model` (explicit config; a disallowed model fails the run)

ui/src/i18n/locales/en.ts

@@ -6120,7 +6120,8 @@ export const en: TranslationMap = {
       model: "Model",
       customModel: "Custom model…",
       modelPlaceholder: "openai/gpt-5.2",
-      modelHelp: "Start typing to pick a known model, or enter a custom one.",
+      modelHelp:
+        "Start typing to pick a known model, or enter a custom one. Routine jobs (summaries, triage, classification) run well on a lighter model — cheaper and faster than your default.",
       thinking: "Reasoning",
       thinkingPlaceholder: "low",
       thinkingHelp: "Use a suggested level or enter a provider-specific value.",