[WEBXP-417] Add circleci signup command with hybrid browser flow#1195

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Fab10-CircleCi wants to merge 3 commits intoCircleCI-Public:mainfrom

Fab10-CircleCi:feat/signup-hybrid-browser-flow

Commits on Mar 24, 2026

[WEBXP-417] Add `circleci signup` command with hybrid browser flow

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Commits on Mar 25, 2026

Adapt signup to cross-origin token delivery flow (Pete's feedback)

Fab10-CircleCi
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claude
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Update root_test.go subcommand count from 29 to 30 for new signup command

Fab10-CircleCi
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