Add museum collection with per-institution search

[seanbonner]

Second curated collection from #6, built on the layer that landed in #7: museum — 16 Punks held in the permanent collections of art institutions, with each institution independently searchable. This is the institution-level granularity raised in #6 ("even specific institutions like MOMA or ZKM").

What's in it

• Nested institutions. A collection can now carry institutions, each with its own aliases and ids. The collection's ids is the union of them. So:

  punks.search({ text: 'museum punks' }) // every institution-held Punk (16)
  punks.search({ text: 'MOMA' })         // just MoMA's (8)
  punks.search({ text: 'zkm' })          // just ZKM's (4)

  Institution aliases resolve through the same whole-phrase, on-by-default path as top-level collections.
• Lookup API. New CuratedCollectionInstitution type; punks.collections.get('museum') carries the institutions array. The bundle's deep-freeze (added in Add curated-collections layer with burned set #7) extends into the nested institutions; the facade still hands out mutable clones.
• Tests + changeset (minor).

Source data

MoMA, ZKM Karlsruhe, LACMA, Centre Pompidou, ICA Miami, and Toledo Museum of Art, per museumpunks.com. The six institutions' holdings union to exactly the 16-Punk set.

V1 / V2 and overlap with burned

standard is v2. Two of the museum Punks — #2838 and #5449, both ZKM acquisitions — were sent to the CryptoPunksMarket contract and are therefore also in the burned set (#7). The nested-institution shape represents that overlap with its proper context rather than flattening it, exactly as #6 described.

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