fix(amr): improve unavailable model gating #14664

Job	Run time
Resolve runner profiles	10s
Static gate	13s
Detect validation scopes	14s
Windows tools-pack payload tests	2m 42s
E2E Vitest	2m 57s
Web workspace tests	3m 28s
Playwright visual (entry-navigation)	2m 24s
Workspace unit tests	1m 28s
Docker image build	3m 57s
UI P0 smoke	2m 6s
Validate Nix flake	4m 19s
Preflight	2m 34s
UI P0 (project-workspace)	4m 58s
Playwright visual (settings-workspace)	3m 17s
UI P0 (project-runtime)	4m 44s
UI P0 (entry-settings)	5m 37s
UI P0 (workspace-restoration)	4m 10s
Playwright critical (${{ matrix.group }})	0s
Validate workspace	6s
Runtime summary	6s
	49m 30s

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