docs: scaffold polisher-control foundation

tests/test_contract_constants.py

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+from polisher_control.telemetry_channels import CORE_CHANNELS
+from polisher_control.contracts import MACHINE_ID
+
+
+def test_machine_id_is_fullum_alpha():
+    assert MACHINE_ID == "fullum-alpha"
+
+
+def test_core_telemetry_channels_are_stable():
+    assert CORE_CHANNELS[:4] == [
+        "timestamp_us",
+        "table_angle_deg",
+        "arm_angle_deg",
+        "fz_n",
+    ]
+    assert "force_setpoint_n" in CORE_CHANNELS