fix: harden release preparation and publish handoff #119

Job	Run time
Minimum OpenAI / Node.js 22	22s
Standalone repository check	1m 6s
Pack the CI artifact	18s
GitHub Actions static validation	21s
Locked OpenAI / Node.js 24.x	1m 13s
Node.js 26 advisory	35s
Locked OpenAI / Node.js 22.x	1m 5s
Latest OpenAI 6.x canary / Node.js 24	0s
Verify the CI artifact round-trip	6s
	5m 6s

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