SY-4299: Strongly-Typed NI Task Types (Part 3 — Driver)

[emilbon99]

Issue Pull Request

Linear Issue

SY-4299

Description

Makes the C++ driver consume the Oracle-generated NI types, completing the third leg of the NI strong-typing work (part 1: core/client types, part 2: console). The driver's hand-rolled JSON parsing and its ~50-class virtual-inheritance channel hierarchy are replaced entirely: the generated wire schemas are now the driver's channel representation, so the driver, console, and all clients parse NI task configs from a single source of truth.

Architecture

The old channels.h fused three concerns per channel class: JSON parsing, converted-field storage, and the DAQmx apply() call. After this PR there are exactly two kinds of code left:

• Two generic wrappers (Input/Output) holding the parsed generated union (AIChannel/CIChannel/DIChannel, AOChannel/DOChannel) plus the runtime state the task binds (resolved Synnax channel, device location).
• One free apply(const GeneratedChannel &, ApplyContext &, dmx, handle) function per channel type (47 total) that converts strings to DAQmx constants inline and makes the hardware call. Dispatch is std::visit over the generated unions, so adding a schema variant without a driver apply is a compile error instead of a runtime failure.

parse_input/parse_output dispatch on the task type through the generated union parsers, so each task accepts exactly its own channel family at parse time with proper field errors. Legacy wire keys (terminalA/B/Z, activeEdge, ai_frequency_voltage) are normalized into the schema fields at parse, so configs persisted by old consoles keep byte-identical behavior.

Testing

Adds a generated recording FakeAPI for the full 397-method DAQmx surface. Every channel test now parses a wire fixture and asserts the actual DAQmx call and its arguments (physical channel string, converted unit/enum constants, scalars) — strictly stronger than the old tests, which asserted intermediate converted members and never exercised the DAQmx boundary.

Plumbing and newly working

• Adds //client/cpp/ni, //client/cpp/task/common, and //driver/ni/daqmx:fake Bazel targets; //driver/ni/channel is the first driver consumer of generated client types.
• Eight channel types that existed but had no factory mapping (ai_voltage_rms, ai_current_rms, ai_voltage_with_excit, ai_accel_charge, ai_thermistor_iex/_vex, ai_rosette_strain_gage, ai_freq_voltage) are now configurable, and CreateAIThrmstrChanVex (declared but never implemented) now links.
• Table scales now parse (the legacy parse read pre_scaled/scaled while consoles always wrote pre_scaled_vals/scaled_vals); polynomial scales use the schema's reverse_coeffs directly; rosette strain gauges pass the full measurement-type array to DAQmx instead of only the first entry.
• Counter read tasks support per-channel devices (cross-device), covered by a new config test.

Basic Readiness

• I have performed a self-review of my code.
• I have added relevant, automated tests to cover the changes.
• I have updated documentation to reflect the changes.