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HtmlHelpers: srcdoc triggers a migration warning for a value previously rendered as HTML

With Feature::MigrationWarnings, a plain srcdoc value that renders as a different
document now than before (it contains '<' or a character reference) triggers
a warning suggesting to wrap trusted HTML in Latte\Runtime\Html. Text such as
'a & b' renders the same document as before and stays quiet; so does an Html
object, whose tags were stripped before and are kept now. |accept silences it.

It covers dynamic attributes (srcdoc={$x}, srcdoc="{$x}") and n:attr. A mixed
value like srcdoc="<p>{$x}</p>" is escaped by code the Escaper emits, which has
no access to feature flags, so it does not warn.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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