Map physical resistor color bands onto the IEEE zigzag schematic symbol.
Each sub-segment is colored to match its band (digit, multiplier, tolerance),
with wire-colored entry/exit and a gap before tolerance mimicking real spacing.
Parseable values 0.01–1GΩ get color; parametric/out-of-range fall back to mono.
Machine-readable API docs at /llms.txt for LLM collaboration on circuit
design notebooks linked from Mims Electronics Reference Library.
Compose endpoint creates fully-populated notebooks in one call with
optional SPICE simulation. Per-cell try/except ensures partial simulation
failures don't lose the notebook.
Also extracts get_engine to spicebook.engine and makes
generate_notebook_id a public API.
