fix(agent-core-v2): restore turn-start model fallback (#364) #354

Job	Run time
Wait for CI and Nix Build	4m 7s
Release	1m 44s
Publish VS Code extension	-1s
Cut desktop release tag	-1s
Native release artifact	-1s
Release lane summary	11s
Publish native release assets	-1s
Deploy docs	-1s
Update Homebrew tap	-1s
Verify release consistency	0s
Verify Homebrew install (${{ matrix.os }})	-1s
Redeploy CDN	-1s
	5m 54s

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