v8.0.0-rc.11-dev.20: Add documented PSL attribute signature help (#30312)

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Adds documented signature help for PSL attribute arguments using shared built-in and extension metadata. Changes Require documentation on attribute specs, nested signatures and parameter declarations; migrate repository-owned declarations and completion consumers. Register automatic ( and , triggers and explicit requests, with named-parameter selection, nested-call help, unknown-function suppression and incomplete-i…

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