feat(spawn): add --model to launch spawned agents on a chosen model#220
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`spawn.sh --model <id>` launches the agent on a specific model. The id is pass-through — handed to the CLI unchecked (the CLI rejects an unknown id), so agmsg never has to track each vendor's model list, which would go stale. The model FLAG spelling differs per CLI, so it comes from the manifest `model_arg=`: claude-code uses `--model`, codex uses `-m`. A type with no model_arg has no known flag, so `--model` is refused with a clear error rather than guessed. The flag is inserted into the direct-CLI launch between the binary and the actas prompt. Tests: per-type flag spelling lands in the boot script (claude `--model`, codex `-m`); a type with no model_arg is refused; no --model leaves the launch flag-free.
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What
Adds
spawn.sh --model <id>to launch a spawned agent on a specific model.How
model_arg=(claude-code→--model,codex→-m). The flag is inserted into the direct-CLI launch between the binary and the actas prompt.model_arghas no known flag, so--modelis refused withagent type 'X' does not support --modelrather than guessed.Tests
--modellands the per-type flag in the boot script (claude--model <id>, codex-m <id>).--modelon a type with nomodel_argerrors clearly.--modelleaves the launch flag-free.Per-type
model_argAdded for the spawnable types:
claude-code→--model,codex→-m,grok-build→--model. The motivating case is/agmsg spawn grok-build <name> --model grok-build— spawning grok on the grok-build model (X search needs it; the composer-fast default can't). gemini/cursor aren't spawnable, so they don't need it yet.Rebased onto
mainafter #216 (grok-build) and #219 (delivery scoping) landed.Closes #135.