[eas-cli] Add `eas chat` command#4005

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jonsamp wants to merge 12 commits into

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jon/eng-24455-eas-chat-command

Commits on Jul 12, 2026

[eas-cli] Add hidden `eas chat` command
jonsamp
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[eas-cli] Update changelog PR link for `eas chat`
jonsamp
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[eas-cli] Render markdown and steer output for `eas chat`
jonsamp
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[eas-cli] Add readline REPL with history and slash commands to `eas chat`
jonsamp
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[eas-cli] Fix `eas chat` interactive prompt exiting immediately
jonsamp
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[eas-cli] Auto-scope `eas chat` to the current directory's project
jonsamp
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[eas-cli] Seed `eas chat` history with the initial command-line message
jonsamp
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[eas-cli] Label and align `eas chat` speakers (Chat > / Expo >)
jonsamp
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[eas-cli] Wrap `eas chat` reply to terminal width and indent the spinner
jonsamp
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[eas-cli] Fix `eas chat` reply indent after spinner and reorder intro
jonsamp
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[eas-cli] Render `eas chat` spinner with the Expo label prefix
jonsamp
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[eas-cli] Decode `eas chat` stream with StringDecoder to avoid splitting multi-byte characters
jonsamp
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