🤖 fix: support ssh workspace forks

[ammar-agent]

Summary

• Enable SSH workspace forks by copying the source workspace on the remote host to preserve local state.
• Extend fork IPC + runtime tests to cover SSH/local matrix and uncommitted file preservation.

Background

• SSH forks were previously blocked and used git clone semantics, which dropped uncommitted changes.
• The fork flow should behave like local forks and preserve working tree state.

Implementation

• Switch SSHRuntime fork to cp -a and update fork error/log messaging.
• Allow SSH forks in WorkspaceService (keep Docker blocked).
• Add SSH/local fork test matrix and helper support; assert uncommitted files carry over in SSH runtime tests.

Validation

• make static-check

Risks

• SSH fork now copies entire worktree, which may increase fork time for large repos.

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