chore(main): release 0.4.2

[github-actions]

🤖 I have created a release beep boop

0.4.2 (2025-10-06)

🩹 Fixes

• ensure header keys are case-insensitive (#251) (db8251a)
• functional response validation failure (#246) (e1dc575)
• resolve syntax error in generated openapi json (#253) (fd47b61)

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[github-actions]

🤖 Created releases:

• v0.4.2

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