Add RFC for snapshot copy between repositories

[rmanibus]

Summary

• add RFC 0017 for cross-repository snapshot copy
• define CLI and client API direction for copy semantics
• document provenance, dedup, and operational expectations

Testing

• not run (RFC only)

[Copilot]

Pull request overview

Adds a new RFC describing cross-repository snapshot copy semantics for Cloudstic, along with minor RFC index/status updates.

Changes:

• Add RFC 0017 proposing a cloudstic copy command and corresponding client API direction for snapshot migration between repositories.
• Update the RFC index to include RFC 0017.
• Mark RFC 0011 and RFC 0014 as “Implemented”.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
rfcs/README.md	Adds RFC 0017 to the RFC index.
rfcs/0017-snapshot-copy-between-repositories.md	New RFC defining proposed CLI/API surface, semantics, and operational expectations for snapshot copy.
rfcs/0014-workstation-onboarding-and-profile-scaffolding.md	Updates RFC status to Implemented.
rfcs/0011-profile-credential-storage-backends.md	Updates RFC status to Implemented.

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