Synchronize README and wireframe docs

[blackopsrepl]

Closes #11.

Summary

• update README feature descriptions and project structure to match the current repository layout
• correct CSS source file names and mention the workflow entry points that now exist in the repo
• trim wireframe sections that implied unsupported rail and Gantt behaviors on the current branch

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Normalize singleton badges values before calling forEach

SF.rail.createCard now assumes config.badges is an array, but the new API shape also encourages simple badge entries such as a single string/object. In the one-badge case ({ badges: 'TEMPRA' } or { badges: { label: 'HOT' } }), this branch reaches config.badges.forEach(...) and throws, so the entire rail card fails to render. Coercing non-array inputs to a one-element array would make the new badge support safe for scalar configs as well.

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