v0.5.0

• Add the optional openarm_tactile capture API and tactile extra, pinning the
  external community Paxini SDK. Core imports remain hardware-passive and free
  of GUI/serial dependencies. SDK sources and coordinate data are not vendored.
• Add openarm-runtime tactile for IP-M2324-Core 68-point serial sensors, with
  explicit device ID, independent capture, stale/error state, manual reconnect
  and bounded shutdown. Raw force counts are not calibrated newtons.
• Add a left-arm dual-sensor workspace with 3D force views, point readouts, curves
  and independent controls. Preserve the browser-confirmed sensor order; both
  sensors belong to the left arm and the right arm has no tactile sensor.
• Add explicit software simulation, external workstation configuration and
  installed-package regression coverage. Previously documented dual-sensor
  hardware trials observed pressure responses and no capture errors; release
  checks are offline and do not move motors or open tactile hardware.