t-paliad-222 follow-up — wire .code into the parent-project picker so
two same-titled projects in different trees can be disambiguated by
their auto-derived dotted code. Search includes the code; the badge
renders only when distinct from the manual reference.
Excel __meta sheet still pending — the JSON code field is populated
by PopulateProjectCodes for every list payload, so the export
generator only needs to add one row in a follow-up shift.