feat(cli): emit one-line update notice in non-interactive mode

[bj456736]

When running in non-interactive mode (e.g., --prompt or piped usage), the version check was completely silent even when a newer version was available. This left CI/print-mode users unaware of updates.

Changes:

• Writes a terse stderr notice when running non-interactively and a newer version is known from cache:

  notice: @moonshot-ai/kimi-code 0.4.0 -> 0.5.0 available. Run `kimi upgrade` to update.
  

• Only fires when cache already knows an update is available (no extra network overhead).
• Does not block or prompt for install; purely informational.
• Emits telemetry event update_notified_non_interactive for observability.

Test coverage:

• Added new test: 'emits a one-line stderr notice in non-interactive mode when an update is available'
• All 24 preflight tests pass (1 pre-existing export test failure unrelated).

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2f712b1

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[pkg-pr-new]

pnpm dlx https://pkg.pr.new/@moonshot-ai/kimi-code@2f712b1

npx https://pkg.pr.new/@moonshot-ai/kimi-code@2f712b1

commit: 2f712b1