--no-logo help text still says "NUKE logo"

Problem

FalloutBuild.NoLogo carries a pre-rebrand description in both the XML doc comment and the [Parameter] attribute (src/Fallout.Build/FalloutBuild.cs:138-141), so --help prints:

  --no-logo                       Disables displaying the NUKE logo.

The same string is baked into the generated .fallout/build.schema.json, which drives IDE completion.

Outcome

User-facing parameter text names Fallout, not NUKE.

Acceptance criteria

• --help shows "Disables displaying the Fallout logo."
• .fallout/build.schema.json regenerated
• A spec guards the built-in parameter descriptions against pre-rebrand product names

Notes

Scope is the user-facing parameter text only. Deliberate NUKE references (attribution, the ☢ survived the NUKE tagline, shim docs) stay.