Bug

Cron jobs with payload.model overrides (e.g., Haiku on a Sonnet-primary agent) fail with LiveSessionModelSwitchError when running as sessionTarget: "isolated".

Reproduction

1. Configure an agent with primary model anthropic/claude-sonnet-4-6
2. Create an isolated cron job with payload.model: "anthropic/claude-haiku-4-5"
3. Wait for the job to fire

Expected: Job runs with Haiku as documented ("We recommend model overrides only for isolated jobs")
Actual: LiveSessionModelSwitchError: Live session model switch requested: anthropic/claude-sonnet-4-6

Root Cause

New in v2026.3.28: src/agents/live-model-switch.ts adds live model switch detection. In src/agents/pi-embedded-runner/run.ts:452-457, resolvePersistedLiveSelection() fires on every run loop iteration unconditionally — including for cron/isolated sessions.

For cron jobs: the run starts with the payload model override (Haiku), but resolvePersistedLiveSelection() reads the session entry which has no modelOverride set → falls back to resolveDefaultModelForAgent() → returns the agent's primary (Sonnet) → mismatch detected → error thrown.

The check doesn't distinguish between:

• Interactive session: user changed model in a live Discord conversation (intended use case)
• Cron job: payload has a different model than the agent default (should be allowed)

params.trigger === "cron" is available at the call site and could be used to skip the check.

Suggested Fix

In src/agents/pi-embedded-runner/run.ts, guard the live model switch check:

// Line ~451
if (params.trigger !== "cron") {
  const nextSelection = resolvePersistedLiveSelection();
  if (hasDifferentLiveSessionModelSelection(resolveCurrentLiveSelection(), nextSelection)) {
    log.info(`live session model switch detected...`);
    throw new LiveSessionModelSwitchError(nextSelection);
  }
}

Same guard needed at the two other throw sites (~lines 598 and 613).

Impact

All cron jobs with model overrides on agents whose primary model differs. In our deployment: 46 jobs affected, forcing us to remove all Haiku overrides and run everything on Sonnet (~3x cost increase for lightweight maintenance jobs).

Environment

• OpenClaw 2026.3.28 (9ac1eba)
• macOS, Node 25.5.0
• Agents with anthropic/claude-sonnet-4-6 primary model
• Cron jobs with anthropic/claude-haiku-4-5 payload override
• sessionTarget: "isolated" on all affected jobs