feat: add node tests, integration tests, API reference, fix pumpingStation bug
- Add 127 unit tests for measurement, pumpingStation, reactor, settler specificClass
- Add 32 integration tests for parent-child registration flows
- Fix pumpingStation tick() calling non-existent _calcTimeRemaining (was _calcRemainingTime)
- Add API reference documentation for all generalFunctions modules
Total tests: 536 (389 Jest + 23 node:test + 124 legacy), all passing
Closes #17, #19, #20
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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