* fix(ui/agents): make A2A skill tags enterable and validated
Skill tags were marked required but rendered as a comma-split text input
that couldn't surface validation and let empty values save. Switch tags
and examples to Select tag inputs, drop the misleading "Required" skills
label (the API allows zero skills), and validate the full configure step
so an added skill must be complete before advancing.
Resolves LIT-3153
* fix(ui/agents): allow Enter to create skill tags/examples
Drop open={false} from the tags and examples Select inputs. With the
dropdown forced closed, AntD suppresses the "create from input" option,
so pressing Enter (as the placeholder instructs) did nothing. Matches the
existing extra_headers Select.
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