fix(trappist-1): pin the world files that carry b's and e's orbit colors

[alowpoly]

#1524 gave TRAPPIST-1 b and e a color for their orbits, but did not pin the two prepared world files that carry it. A deploy restores those files from the asset host by inventory, so production would still have drawn both orbits in the default gray.

This pins the regenerated files: members.json of trappist-1-system (2,677 to 2,739 bytes) and the root's world-context.json (50 bytes longer). Each grew by the two colors and nothing else.

Prepared assets

• Regenerated the world files (node site/build/prepare/world/prepare-spatial-context.ts, then pin-world-files.mts: 2 inventories changed).
• Published the bytes (publish-runtime-assets.mts --object=trappist-1-system --object=observable-universe --since=origin/main).
• Committed the two refreshed inventory.json files, and no baked files.

Proves the change: both files answer 200 on the asset host at their new content addresses, with the pinned byte counts.

Limits: not deployed; the last deploy predates #1524.

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