feat(interpreter): implement background execution with & and wait#590
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feat(interpreter): implement background execution with & and wait#590
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Closes #559 - Background commands (`cmd &`) now properly set `$!` to a job ID and store results in the job table for later retrieval - `wait` builtin now collects background job exit codes correctly - `wait $pid` waits for a specific job by ID - Job table uses BTreeMap for ordered iteration - Execution remains synchronous for deterministic output ordering in the virtual environment, but the job lifecycle is tracked - Added 7 integration tests covering basic background, VFS writes, multiple jobs, $!, wait with PID, exit codes, and mixed fg/bg
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Summary
cmd &) now properly set$!and track job statewaitbuiltin collects background job exit codes correctlywait $pidwaits for specific job by IDCloses #559
Test plan