1.9.0

• Added a unified, seekable generated-code I/O stream abstraction that retains libc for external files and uses memory records for internal files.
• Removed internal-file tmpfile() simulation and copy-back, with character scalar and array records, multiple records, PAD, positioning, and overflow status handling.
• Migrated explicit formatting, list-directed I/O, NAMELIST, and defined I/O to the same stream interface while retaining bulk external-file transfers.
• Added internal-file format constraints that reject standard-prohibited nonadvancing controls and unformatted transfers.
• Split list-directed and memory-stream generation support out of the core transpiler into dedicated modules.
• Added native Fortran semantic differentials, strict C17, sanitizer, and filesystem-free WebAssembly execution coverage.