Drop pre-native-engine test fixtures

All of these reference model: values from the old GxEPD2-template/catalog-
driven display.py (a handful coincidentally still match current model
names, most don't) - superseded by today's properly-named, current
fixtures (test_gxepd2_426_gdeq0426t82, _583_gdeq0583t31,
_290c_gdey029f51_native, _579c_gdey0579f51[_master_only]). The bar/ladder/
diagonal test pattern staged into a few of these today is preserved in
those current fixtures and in claude/DESIGN.md, not lost.

tests/test_gxepd2_290_t94.esp32-idf.yaml

@@ -1,30 +0,0 @@
-esphome:
-  name: gxepd2-test
-
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-
-logger:
-
-display:
-  - platform: gxepd2
-    model: GxEPD2_290_T94
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_290c_gdey029f51.esp32-idf.yaml

@@ -1,25 +0,0 @@
-esphome:
-  name: gxepd2-test-290c-gdey029f51
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-logger:
-display:
-  - platform: gxepd2
-    model: GxEPD2_290c_GDEY029F51
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_3c.esp32-idf.yaml

@@ -1,24 +0,0 @@
-esphome:
-  name: gxepd2-test-3c
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-logger:
-display:
-  - platform: gxepd2
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_420.esp32-idf.yaml

@@ -1,31 +0,0 @@
-esphome:
-  name: gxepd2-test2
-
-esp32:
-  board: esp32dev
-  toolchain: esp-idf
-  framework:
-    type: esp-idf
-
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-
-logger:
-
-display:
-  - platform: gxepd2
-    model: GxEPD2_420
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_4c.esp32-idf.yaml

@@ -1,26 +0,0 @@
-esphome:
-  name: gxepd2-test-4c
-esp32:
-  board: esp32dev
-  toolchain: esp-idf
-  framework:
-    type: esp-idf
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-logger:
-display:
-  - platform: gxepd2
-    model: GxEPD2_154c_GDEM0154F51H
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_579c_master_only_debug.esp32-idf.yaml

@@ -1,25 +0,0 @@
-esphome:
-  name: gxepd2-test-579c-debug
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-logger:
-display:
-  - platform: gxepd2
-    model: GxEPD2_579c_GDEY0579F51
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_7c.esp32-idf.yaml

@@ -1,25 +0,0 @@
-esphome:
-  name: gxepd2-test-7c
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-logger:
-display:
-  - platform: gxepd2
-    model: GxEPD2_565c_7C
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_dualcs.esp32-idf.yaml

@@ -1,26 +0,0 @@
-esphome:
-  name: gxepd2-test-dualcs
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-logger:
-display:
-  - platform: gxepd2
-    model: GxEPD2_1085_GDEM1085T51
-    cs_pin: 5
-    cs2_pin: 21
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_paged_bw.esp32-idf.yaml

@@ -1,25 +0,0 @@
-esphome:
-  name: gxepd2-test-paged
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-logger:
-display:
-  - platform: gxepd2
-    model: GxEPD2_1020_GDEM102T91
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);

tests/test_gxepd2_shared_bus.esp32-idf.yaml

@@ -1,39 +0,0 @@
-esphome:
-  name: gxepd2-test-shared
-
-esp32:
-  board: esp32dev
-  framework:
-    type: esp-idf
-
-external_components:
-  - source:
-      type: local
-      path: ../components
-    components: [gxepd2]
-
-spi:
-  clk_pin: 18
-  mosi_pin: 23
-
-logger:
-
-display:
-  - platform: gxepd2
-    model: GxEPD2_290_T94
-    cs_pin: 5
-    dc_pin: 17
-    reset_pin: 16
-    busy_pin: 4
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);
-  - platform: gxepd2
-    model: GxEPD2_420
-    cs_pin: 19
-    dc_pin: 27
-    reset_pin: 14
-    busy_pin: 25
-    update_interval: 60s
-    lambda: |-
-      it.fill(Color::WHITE);