🎨 Palette: Add real-time visual feedback to playbook execution

[adolago]

💡 What: Added real-time visual feedback to the rustible run command by hooking the Executor's event stream to the CLI OutputFormatter.
🎯 Why: Previously, rustible run was silent by default (relying on tracing logs which are hidden at default verbosity), providing no feedback until the final recap. Users couldn't see which task was running or the result of individual tasks.
📸 Before/After:

• Before: Silence... -> Recap.
• After:

  PLAY [Configure web servers] 
  TASK [Install nginx] 
  ✔ ok       : [localhost]
  TASK [Start nginx] 
  ✎ changed  : [localhost]
  

♿ Accessibility: Output is buffered to ensure atomic line printing, preventing interleaved/garbled text when tasks complete in parallel, ensuring screen readers (and humans) can read complete lines.

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PR created automatically by Jules for task 13989062477542473043 started by @dolagoartur

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Emit global task-start only for runnable tasks

TaskStartGlobal is emitted before host filtering, so callbacks now report TASK [...] even when the task never runs (for example when active_hosts is empty because all hosts already failed, or block-state filtering skips that task and the loop continues/breaks). This makes the new real-time output inaccurate and can leave users with task headers that have no corresponding results; move the emit to after the active_hosts.is_empty() guard (and after any step-mode skip decisions) so the event means execution actually started.

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