BB Skills independent packaging notice

Source: google-gemini/gemini-skills, commit 832c8f94114dc343d86ff27296fe9335b45affa0.
The upstream Apache-2.0 license is retained in full. All four selected original
repository files are retained byte-for-byte under upstream-original. The primary
SKILL.md and migration reference are unchanged copies. No upstream instruction
or command was applied to the website or to this development session.

The upstream README states that this is not an officially supported Google
product. Its performance percentages are upstream claims, not BB Skills results.
The BB Skills Python fixture, its README and evidence are independent additions.
No original TypeScript example or real Gemini API call was executed. No provider
endorsement, production authentication or model-availability claim is made.
