Ensure output files respect configured output path by calling readcio_read first

[Copilot]

Moving readcio_read earlier exposed a downstream ordering issue: the three initial output files were opened before init_output_path ran, so they always landed in the working directory regardless of the out_path configured in file.cio.

Changes

• src/proc_bsn.f90: Promoted call readcio_read to the very first statement in proc_bsn, ahead of all open_output_file calls.

! Before
call open_output_file(9000, "files_out.out")   ! out_path not yet set
call open_output_file(9001, "diagnostics.out", 8000)
call open_output_file(9004, "area_calc.out", 80000)
call readcio_read                              ! init_output_path called here

! After
call readcio_read                              ! init_output_path called first
call open_output_file(9000, "files_out.out")   ! out_path now respected
call open_output_file(9001, "diagnostics.out", 8000)
call open_output_file(9004, "area_calc.out", 80000)

All subsequent reads (basin_read_cc, basin_read_objs, time_read, etc.) also continue to benefit from having the input_file_module paths populated from file.cio before use.

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