docs: scaffold polisher-control foundation

host/polisher_control/telemetry_channels.py

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+CORE_CHANNELS = [
+    "timestamp_us",
+    "table_angle_deg",
+    "arm_angle_deg",
+    "fz_n",
+    "mx",
+    "my",
+    "mz",
+    "spindle_rpm_actual",
+    "table_rpm_actual",
+    "arm_amplitude_deg_derived",
+    "arm_center_deg_derived",
+    "machine_state",
+    "force_setpoint_n",
+]
+
+RECOMMENDED_CHANNELS = [
+    "fx_n",
+    "fy_n",
+    "ft_status",
+    "z_servo_iq_v",
+    "z_brake_engaged",
+    "spindle_drive_state",
+    "spindle_drive_error",
+    "spindle_bus_voltage_v",
+    "spindle_iq_a",
+    "spindle_motor_temp_c",
+    "arm_angle_linearized_deg",
+    "table_rpm_setpoint",
+    "spindle_rpm_setpoint",
+    "force_actuator_cmd",
+    "estop_active",
+    "interlock_state",
+    "mode",
+    "fz_raw_n",
+    "fz_contact_n",
+]
+
+CSV_HEADER = CORE_CHANNELS