docs: tighten formula verify workflow guidance

[wenzhuozhen]

Summary

• rename the formula verify reference to Lark Sheet Formula Verify
• make formula-writing guidance explicitly route into +formula-verify as the default close-out
• sync the updated lark-sheets skill references from sheet-skill-spec

Verification

• env GOROOT=/usr/local/opt/go/libexec PATH=/usr/local/opt/go/libexec/bin:/usr/local/bin:$PATH go generate ./shortcuts/sheets/...
• env GOROOT=/usr/local/opt/go/libexec PATH=/usr/local/opt/go/libexec/bin:/usr/local/bin:$PATH go test ./shortcuts/sheets/...

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