Remove auto registering stream

[laoneo]

User description

joomla/joomla-cms#45402

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PR Type

documentation

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Description

• Documented change: BufferStreamHandler no longer auto-registers stream

• Added migration note for manual stream registration requirement

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Changes walkthrough 📝

	Relevant files
Documentation	removed-backward-incompatibility.md Document BufferStreamHandler stream registration change    migrations/54-60/removed-backward-incompatibility.md Added section documenting BufferStreamHandler no longer auto-registers Provided PR link and file reference for the change Explained that extensions must now call stream_register() manually +6/-0

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[softforge]

Thanks @laoneo for your manual entry