fix(gps): make ephemeris flash persistence hardware-safe

Add freestanding S25FL256S read/program/erase/verify support and seed a newly formatted ephemeris store with stale records. Age-gate navigation readiness, persist the continuous Toe week, and regenerate the Genesys2 MAX2771 integration and flash image.

soc/software/gps_system/header/gps/gps_ephemeris_store.h

@@ -29,7 +29,8 @@
 #define GPS_EPH_STORE_SLOT_SIZE     256u   /* one flash page */
 #define GPS_EPH_STORE_MAGIC         0x45504853u /* "EPHS" */
 #define GPS_EPH_STORE_HEADER_MAGIC  0x45504844u /* "EPHD" */
-#define GPS_EPH_STORE_VERSION       1u
+#define GPS_EPH_STORE_VERSION       2u
+#define GPS_EPH_STORE_INITIAL_SEED_COUNT 9u
 
 typedef struct {
 	/* Reads never fail on NOR flash; erase/program report success. */
@@ -124,4 +125,13 @@ bool gps_ephemeris_store_save(
 /* Erase both sectors and start an empty generation. */
 bool gps_ephemeris_store_format(gps_ephemeris_store_t* store);
 
+/*
+ * Populate a newly formatted store with structurally valid but deliberately
+ * stale LNAV records.  These records exercise the complete flash/CRC/parser
+ * restore path on first boot; the normal ephemeris age gate prevents them from
+ * entering a position solution.  Returns the number of records written.
+ */
+unsigned int gps_ephemeris_store_seed_initial(
+	gps_ephemeris_store_t* store);
+
 #endif

soc/software/gps_system/header/gps/gps_ip_defines.h

@@ -161,6 +161,9 @@
 			#ifndef GPS_EPHEMERIS_FLASH_FORCE_FORMAT
 			#define GPS_EPHEMERIS_FLASH_FORCE_FORMAT 0
 			#endif
+			#ifndef GPS_EPHEMERIS_FLASH_SEED_INITIAL
+			#define GPS_EPHEMERIS_FLASH_SEED_INITIAL 1
+			#endif
 			#ifndef GPS_EPHEMERIS_FLASH_BASE
 			#define GPS_EPHEMERIS_FLASH_BASE 0x01FE0000UL
 			#endif