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ci: stabilize dependency updates and packed fixture versions #165

Job	Run time
Locked OpenAI / Node.js 22.x	53s
GitHub Actions static validation	11s
Node.js 26 advisory	34s
Pack the CI artifact	15s
Minimum OpenAI / Node.js 22	26s
Locked OpenAI / Node.js 24.x	1m 14s
Standalone repository check	1m 9s
Latest OpenAI 6.x canary / Node.js 24	-1s
Verify the CI artifact round-trip	4s
	4m 45s