feat: accept model in task payload, forward to --model#13
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When the platform dispatcher sends a `model` field in the task payload, pass it through to claude as `--model <value>`. Validated against a narrow allowlist before reaching the CLI to avoid arg-injection through attacker-controlled OAuth payloads. This closes a real cost cliff: previously claude defaulted to whatever the device's local CC was configured to (which can be any tier the device's OAuth account happens to be on). One device defaulting to Opus caused 7-10x cost concentration on routine healthchecks. With this change the dispatcher controls model selection regardless of local defaults. Bumps minor (3.1.x -> 3.2.0) since this adds a new field that older platform releases will simply ignore — backward compatible.
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Summary
modelfield in the task payload.Test plan
modelfield in payload → behavior unchanged (falls through to local default)--model <value>appended to argv