feat: add M95M02-only GAS and EEPROM profiles

Expose the existing registers through Modbus and service CAN using one GAS provider only in M95M02 builds.
Include the EEPROM layout/driver, LOAD protection and calibration, firmware identity and shared CCS build workflow.
Add transport/profile and SCI8 validation tests, documentation and the checked M95M02 firmware image.

Source/Internal/Include/gas167.h

@@ -0,0 +1,28 @@
+#ifndef BALSAM167_GAS_H
+#define BALSAM167_GAS_H
+#include "eeprom_config.h"
+#include <stdint.h>
+
+/* Board profile 167/v1, word addresses, independent of the wire transport.
+ * The original register and UMP addresses remain valid in both builds.
+ * Only the physically fitted M95M02 version exposes the additional regions. */
+#if EEPROM_M95M02
+#define GAS167_REG_BASE 0x5000U
+#define GAS167_REG_COUNT 128U
+#define GAS167_INFO_BASE 0x5F00U
+#define GAS167_INFO_WORDS 8U
+#define GAS167_MAX_WORDS 124U
+#define GAS167_PROFILE_VERSION 1U
+#define GAS167_CAPABILITIES 7U /* bit 0 RTU, bit 1 service CAN, bit 2 FC06 */
+
+/* Called by the main-loop transports under their snapshot IRQ lock.
+ * Capacity: at least GAS167_MAX_WORDS uint16_t words.
+ * RTU reads: 1..124 words; paired service CAN reads: 2..124, even.
+ * Successful reads return their count. Writes/errors return address/value.
+ * error uses Modbus codes 0 (success), 1 (function), 2 (address), 3 (value).
+ * No EEPROM I/O, allocation, or changes to the existing logger. */
+int gas167_contains(uint16_t address);
+unsigned gas167_prepare(unsigned function, uint16_t address, uint16_t value,
+    int can, uint16_t *reply, unsigned *error);
+#endif
+#endif