Here are the classes, structs, unions and interfaces with brief descriptions:

Nespectre
CBaseDetector	Abstract base class for motion detection algorithms
CChannelShapeTrajectoryTracker
CDirectWebSocketRequest
CDirectWebSocketServiceConfig
CDirectWebSocketServiceDiagnostics
CEspectreCommand	A parsed control command
CEspectreDeviceConfig	Device identity and broker settings
CEspectreDeviceInfo	What the device advertises about itself
CEspectreNetworkInfo	Link details available to frontends
CEspectreOtaStatus	Full OTA status: state, the versions involved, and the resolved URLs
CFilteredTurbulenceRing	Fixed-capacity turbulence history with optional Hampel and low-pass filtering
Champel_turbulence_state_t
CHighAccuracyDetector	Neural motion detector, using the MLP weights exported by training
CIDirectWebSocketService	Local WebSocket endpoint used by the Native frontend after Wi-Fi is ready
CIEspectreRuntime	The sensing backend behind RuntimeFrontendController
CIMqttTransport	The MQTT client seam
CIOtaService	The firmware-update seam
CIRuntimeListener	Everything the runtime tells your firmware
CL1DeltaTracker
CL1DeltaWindow	One sliding window of displacements over a caller-owned ring
CLightweightDetector	The default detector: self-calibrating, no training data required
Clowpass_filter_state_t
CMeanVariance
CMLSeriesScratch
CMLSeriesStats
CMLStatNeeds
CMqttTransportDiagnostics
CRuntimeCapabilities	What a runtime actually offers its frontend
CRuntimeConfig	Everything the runtime needs to know before setup()
CRuntimeDiagnosticsSample	Rate and link diagnostics derived from cumulative runtime counters
CRuntimeDiagnosticsSampler	Converts cumulative diagnostics into rates over the interval between reads
CRuntimeDiagnosticsSnapshot	Low-frequency counters and radio state used by optional diagnostic surfaces
CRuntimeFrontendController	The recommended entry point for firmware embedding ESPectre
CRuntimeSnapshot	A consistent view of the sensing state at one instant
CStartupThresholdCalibrator	Startup threshold calibrator with a motion-first primary path and an internal quiet-first fallback