Fix multi-path modules adding duplicate dependencies in tach sync
#569
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When using a multi-path module,
tach syncmay add the same dependency multiple times. This is because each module path independently detects its dependencies and queues additions.This PR fixes the behavior by checking at edit-time whether the dependency already exists. This is appropriate because the 'bulk module' concept is isolated to the TOML representation, and isn't known when sync is detecting dependencies.