Decide on input handling for generate command #37
Description
When no --input is provided, the generate command builds the IR path using the target language (resolve_compile_output(..., &target_lang, ...)). If a user compiles from a different frontend language (e.g., gleam) and then generates to another target (e.g., scala), the IR is stored under out/<project>/compile/gleam, but generate will look under compile/scala and fail with “IR input path does not exist”. This breaks the default workflow whenever frontend and target differ; the default should be derived from the frontend language in config (or the compile output used by the last compile step), not the backend target.
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Originally posted by @chatgpt-codex-connector[bot] in #36 (comment)