v0.4.0

Breaking

• The negated-pin descriptor fields are renamed from negatedInputs/negatedOutputs to
  negInputs/negOutputs, in JSON boards and in the Node and WASM bindings. The .lgb binary
  format is unchanged.
• UserInput now maps only from component type id 200. Ids 201–299 used to alias it and are
  now rejected as unknown component types.
• Boards whose link_count exceeds 2^31 are rejected with LinkCountOverflow, because the top bit
  of a link id now carries the negation flag.

Changed

• sim bench is time-bound by default: each repeat runs for --ms milliseconds (default 1000) and
  reports the ticks that landed. Pass --ticks N for the previous fixed-tick mode.

Performance

• Pin negation is packed into the top bit of the link ids, so reading or driving a pin no longer
  loads a separate negation bitset. This recovers most of the throughput 0.3.0 lost: on the
  real-world CPU benchmark board the cost drops from 8.4% to 3.2%.