* Add server-side argument completion (@mcp.completion)
* Reference CompletionValues directly in cast so the import reads as used
* Import completion types from mcp_types, not the fastmcp.types mirror
* Fix test imports after dropping the fastmcp.types mirror
* Fix change-register example import after dropping the types mirror
* Enforce 100-value completion cap; make docs example runnable
* Document completion authorization contract
* Offload sync completion handlers to threadpool
* Exclude bare str from completion return type
* Pass Any-typed value in bare-string rejection test
* Point completion authoring types to mcp_types in v4 notes
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