fix: update examples to gpt-5.6-sol #138

Job	Run time
Minimum OpenAI / Node.js 22	26s
Pack the CI artifact	14s
Node.js 26 advisory	39s
Locked OpenAI / Node.js 24.x	1m 12s
Locked OpenAI / Node.js 22.x	1m 16s
GitHub Actions static validation	12s
Standalone repository check	1m 14s
Latest OpenAI 6.x canary / Node.js 24	0s
Verify the CI artifact round-trip	7s
	5m 20s

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