Add read-only source fetch smoke command

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Soph5mo ago

Entire-Checkpoint: 01fbd070bdf2

Checkpoints

Can you take a look at the go code (wasm) in /Users/soph/Work/entire/devenv/entire-io-worktree1 based a bit on that I wonder if something like this can be build:

CodexGPT-5.4
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Checkpoint 1