Archive Milestone (DEPRECATED)

This command has been replaced by gsd-complete-milestone.

<objective> DEPRECATED: This command has been unified into gsd-complete-milestone. </objective> <process> <step name="show_deprecation_and_exit"> Display deprecation notice using GSD branded banner format:

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 GSD ► DEPRECATED
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This command has been unified into the milestone completion workflow.

**Old workflow (deprecated):**
1. {{COMMAND_PREFIX}}complete-milestone    # Mark complete
2. {{COMMAND_PREFIX}}archive-milestone     # Move to milestones/ ← YOU ARE HERE
3. {{COMMAND_PREFIX}}restore-milestone     # Retrieve from milestones/

**New workflow (unified):**
{{COMMAND_PREFIX}}complete-milestone       # Archives directly to history/v{X.Y}/

All milestone files now move directly to `.planning/history/v{X.Y}/`
with mirrored directory structure during completion. Archives are
permanent and git-tracked.

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## Why This Changed

The old multi-step workflow created confusion about when files were
truly archived. The new unified workflow moves everything to permanent
history/ storage in a single atomic operation.

**To review archived milestones:**
{{COMMAND_PREFIX}}list-milestones

**To start new milestone:**
{{COMMAND_PREFIX}}new-milestone

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Exit immediately without executing any operations. </step>

</process>

<success_criteria>

• [ ] Deprecation message displayed with branded banner
• [ ] Clear explanation of old vs new workflow
• [ ] User directed to correct command (complete-milestone)
• [ ] No file operations executed
• [ ] Template variables ({{COMMAND_PREFIX}}) used for cross-platform support </success_criteria>