fix(amr): improve unavailable model gating #14668

Job	Run time
Resolve runner profiles	12s
Detect validation scopes	22s
Static gate	16s
E2E Vitest	3m 8s
Web workspace tests	3m 13s
UI P0 (entry-settings)	4m 11s
Docker image build	4m 3s
Preflight	3m 9s
Workspace unit tests	1m 37s
Windows tools-pack payload tests	3m 12s
UI P0 (project-workspace)	4m 9s
Playwright visual (entry-navigation)	2m 54s
UI P0 (project-runtime)	4m 9s
UI P0 (workspace-restoration)	4m 8s
Validate Nix flake	4m 11s
Playwright visual (settings-workspace)	3m 23s
UI P0 smoke	2m 14s
Playwright critical (${{ matrix.group }})	-1s
Validate workspace	6s
Runtime summary	7s
	48m 43s

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