[codex] Add Brooklyn museums

[alexandriax]

Summary

Add two Brooklyn entries to museums.yaml:

• The Gecko Gallery NYC
• The Bone Museum

The entries include official addresses, coordinates, descriptions, official hours, and available supporting links. The Bone Museum entry also includes press links from Epicenter NYC, Secret NYC, Bushwick Daily, and The New York Groove.

Notes

• No photos were added because this repo's photo fields use existing niche-museums.imgix.net assets.
• The Gecko Gallery NYC does not appear to have comparable independent press coverage, so its press field is omitted.

Validation

• Parsed museums.yaml and checked unique IDs.
• Ran git diff --check.
• Ran ./build.sh using the repo requirements in a temporary virtualenv.
• Verified the rendered /119 and /120 pages and /museums.json locally with Datasette.