apds9960: Auto-enable sensor when reading without active mode.

[nedseb]

Sub-issue of #44.

Problem

After init, all features are disabled (setMode(APDS9960_MODE_ALL, False)). If the user calls readAmbientLight() or readProximity() without first calling enableLightSensor() or enableProximitySensor(), stale/zero data is returned silently.

Similarly, calling disablePower() then readAmbientLight() returns stale data.

Solution

Add auto-enable logic before read methods:

• readAmbientLight(), readRedLight(), readGreenLight(), readBlueLight(): check if AEN (ambient light enable) bit is set in ENABLE register; if not, enable it and wait for a valid reading (poll AVALID in STATUS)
• readProximity(): check if PEN (proximity enable) bit is set; if not, enable it and wait for PVALID
• Add _ensure_light_enabled() and _ensure_proximity_enabled() helpers
• Optionally add isProximityAvailable() method (counterpart to existing isLightAvailable())

Considerations

This driver is a port of the SparkFun APDS-9960 library. The auto-enable pattern is not in the original library but aligns with the project convention (issue #44). The change should be backward-compatible since enabling a sensor that is already enabled is a no-op.

Reference

• WSEN-PADS _ensure_data() pattern (PR wsen-pads: Add pressure sensor driver. #3)
• APDS-9960 datasheet: ENABLE register (0x80) bit definitions

[semantic-release-updater]

🎉 This issue has been resolved in version 0.0.2 🎉

The release is available on GitHub release

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