Add persistent Supermemory CLI mark

[ishaanxgupta]

Summary

• add a persistent Supermemory badge at the bottom of compatible terminals
• preserve existing pet preferences and clean up only plugin-owned assets

[ishaanxgupta]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• Make Supermemory pet state aware #49
• Show update notice outside memory context #48
• Add persistent Supermemory CLI mark #47 👈 (View in Graphite)
• Adopt hook and hosted MCP architecture #46
• Harden recall and capture reliability #44
• Prioritize human-memorable capture #43
• Add bounded direct prompt recall #42
• Improve recall result quality #41
• main

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[ishaanxgupta]