[codex] Support root bl --version

[mstolarzblaxelai]

• Adds root-level bl --version support while preserving -v as verbose.
• Keeps bl version as the detailed version output with commit and build date.
• Skips the tracking prompt for root version checks so install and agent probes stay non-interactive.

Fixes https://linear.app/blaxel/issue/ENG-2800/support-root-bl-version-in-the-cli

---

Note

Moves version/commit/date initialization earlier in Execute() (before promptForTracking()) and sets rootCmd.Version to enable cobra's built-in --version flag. Adds --version to the tracking prompt exemption list via a new isTrackingPromptCommandExempt helper.

^{Written by Mendral for commit c2f3dde.}

[mendral-app]

LGTM

The change is correct. Version vars are initialized and rootCmd.Version is set before promptForTracking(), which is exactly what's needed for --version to work non-interactively. Cobra adds --version lazily during Execute(), so there's no conflict with the -v verbose shorthand registered at line 395.

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