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Harden MCP file and Assembly access #1567

Job	Run time
SDK Supabase Edge fixture	1m 43s
Build package	51s
Lockfile guard	7s
Image package Next.js fixture	5m 12s
Unit tests (Node 24)	1m 45s
Release dry run	2m 38s
Verify (fast)	2m 48s
Verify (full)	3m 47s
E2E tests	3m 5s
Unit tests (Node 22)	1m 0s
Unit tests (Node 20)	1m 50s
Upload coverage	0s
Publish coverage Pages	0s
Slack notification	0s
	24m 46s