improve fixing processing

Skip generating corrected XML when input is already valid; add namespace/wrapper guard for snippets; fix UI wiring; revalidation uses wrapped XML.

AI iteration with re-validation + steps log UI; show steps by default; optional iterate-until-valid with max attempts

WIP before syncing with hf-https/main

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Update RDF examples, move Examples section to top, and use handcuff emoji for SHACL theme

Initial deployment of RDF validation app to new mcp4rdf space