Adds tools/register-transcoder — a Python tool that reads a published Valsts
Kase accounting-process register (.xlsx/.xlsm) and emits BPMN process
skeletons. For a given sub-process it produces one userTask per register
step, swimlanes from the RACI columns (placing each step in its Responsible
actor's lane), sequence flows reconstructed from the register's own
predecessor/successor step references, and synthesised start/end events per
entry and exit step. Output is an isExecutable=false skeleton — the
deterministic first pass of the transcription pipeline; refinement into a
Level 4 executable package is the human/AI-assisted second pass that produced
the curated FG3-1/FG3-4/FG3-5 packages. Includes a README and sample-output
skeletons emitted from the FG3 register for sub-processes 3.5.2 and 3.5.3.
