fix: export Foundation for SSH paste policy

[teamleaderleo]

Summary

Fixes the post-merge Swift package compile failure from #16523 by exporting Foundation from the remote paste policy module before exposing its UUID and URL API.

Sundial g1 🛠️

Validation

The failure was reproduced in hosted macos / swift-package-tests and macos / macOS compile admission on #16523. This change addresses the reported access-control errors directly. Local Swift syntax and repository guards pass.

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Summary by cubic

Fixes the Swift package compile failure by exporting Foundation from the remote paste policy, and moves pasted image uploads into per-session private remote directories with automatic cleanup.

• Uploads now go to ~/.cache/cmux/paste/<session-id>/cmux-paste-<uuid>.<ext> instead of /tmp/cmux-drop-*.
• Adds a policy that creates and maintains the directory, removes stale or oversized files, enforces 0600 permissions, and cleans up on session teardown.
• Rolls back uploaded files on failure and removes the directory when the remote session ends.

^{Written for commit b67f6b0. Summary will update on new commits.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 6d86537 and b67f6b0.

📒 Files selected for processing (10)

• Packages/macOS/CmuxRemoteSession/Sources/CmuxRemoteSession/Session/RemoteSessionCoordinator+Lifecycle.swift
• Packages/macOS/CmuxRemoteSession/Sources/CmuxRemoteSession/Session/RemoteSessionCoordinator+Upload.swift
• Packages/macOS/CmuxRemoteSession/Sources/CmuxRemoteSession/Session/RemoteSessionCoordinator.swift
• Packages/macOS/CmuxRemoteSession/Sources/CmuxRemoteSession/Values/RemotePasteFileTransferPolicy.swift
• Packages/macOS/CmuxRemoteSession/Tests/CmuxRemoteSessionTests/RemotePasteFileTransferPolicyTests.swift
• Sources/TerminalCustomUploadRunner.swift
• Sources/TerminalSSHSessionDetector.swift
• cmuxTests/TerminalAndGhosttyTests.swift
• cmuxTests/TerminalUploadCommandTests.swift
• cmuxTests/WorkspaceRemoteConnectionTests.swift

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