feat(updater): add -y/--yes to skip the upgrade confirmation prompt

[sailist]

Related Issue

Internal request (no linked issue): add a non-interactive flag to kimi update.

Problem

kimi upgrade (alias kimi update) always stops at an interactive arrow-key confirmation before installing, so it cannot run unattended in scripts or automation.

While wiring the flag through, we found the root cause that would have made it silently useless: commander v13 treats program-level options as global — a -y/--yes placed after the subcommand name is swallowed by the main command's -y, --yolo (and hidden --yes), and the subcommand action receives false. The same mechanism means the existing kimi fork -y and kimi export -y flags have been silently broken in production (their tests register subcommands on a bare Command, so the collision never showed).

What changed

• kimi upgrade/kimi update accepts -y, --yes: skips the confirmation prompt and installs the update directly, including in non-interactive terminals. Without the flag the flow is unchanged; install sources that cannot auto-install still print the manual command.
• Enabled enablePositionalOptions() on the program so parent options are only recognized before the subcommand name — the commander-documented fix for reusing an option name in subcommands. This restores kimi fork -y / kimi export -y as a side effect; main-command usage (kimi -y, etc.) is unaffected.
• Threaded yes through handleUpgradeCommand into handleUpgrade's deps; the prompt (and its upgrade_command_prompted telemetry) is skipped when set, upgrade_command_install_selected still fires.
• Tests extended in place (net-zero case count): program routing now asserts the parsed yes value, the non-interactive upgrade case covers direct install with yes, and main.test.ts asserts the dep is passed through.
• Reference docs (en/zh) updated for the new flag; patch changeset added.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue (external PRs: the issue must have a maintainer's /approve).
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: c57be72

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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commit: c57be72