v8.0.0-rc.11-dev.8: Complete recursive PSL attribute values (#30266)

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Summary Extend configured PSL attribute completion through nested functions, lists, records, literals, and namespace-correct field references. Attribute factories remain authoritative: completion inspects combinator metadata, never invokes parsing to choose alternatives, and preserves matching union/function signatures. Prerequisite: #30249 (merged). The maintainer explicitly waived Linear linking and the ticket-pre…

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