parseSpreadsheetRef classified /wiki/ with strings.Index over the whole URL, so a /sheets/ link whose query or fragment merely contained /wiki/ (e.g. .../sheets/sht?from=/wiki/x) was hijacked into a get_node call. Now parse the URL and match /sheets/, /spreadsheets/, /wiki/ only as a path prefix, mirroring slides parsePresentationRef which already fixed this class. Drop the substring helpers. Also align wiki resolution with slides: CallAPITyped (typed error + log_id) and classify an incomplete get_node response as InternalError instead of a --url validation error. Add regression tests for query/fragment /wiki/ and incomplete node.
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