feat(interpreter): implement BASH_SOURCE array variable#832
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Closes #825 — add BASH_SOURCE tracking via bash_source_stack field on Interpreter. Updated in execute_script_content, execute_source, and execute_function_call to maintain source file stack. BASH_SOURCE[0] reflects the current source file, with depth increasing for nested source/function calls. Supports the common source guard pattern: `[[ "${BASH_SOURCE[0]}" == "$0" ]] && main "$@"`
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Summary
bash_source_stack: Vec<String>field to Interpreter[[ "${BASH_SOURCE[0]}" == "$0" ]]Test plan
bash_source_set_in_script— BASH_SOURCE[0] set when executing script by pathbash_source_set_in_sourced_file— BASH_SOURCE[0] set when sourcingbash_source_guard_direct_execution— guard detects direct executionbash_source_guard_sourced— guard detects sourced contextCloses #825