Refactor to use QMK TRI_LAYER_ENABLE feature

Replace manual process_record_user tri-layer logic with QMK's
built-in TRI_LAYER feature:

- Add TRI_LAYER_ENABLE = yes to rules.mk
- Create config.h with layer definitions
- Replace custom LOWER/RAISE keycodes with TL_LOWR/TL_UPPR
- Remove enum atlas_keycodes and process_record_user function

This reduces ~25 lines of boilerplate code to 3 config lines.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

keyboards/cannonkeys/atlas/keymaps/vnz/config.h

@@ -0,0 +1,6 @@
+#pragma once
+
+// Tri Layer configuration
+#define TRI_LAYER_LOWER_LAYER 1
+#define TRI_LAYER_UPPER_LAYER 2
+#define TRI_LAYER_ADJUST_LAYER 3

keyboards/cannonkeys/atlas/keymaps/vnz/keymap.c

@@ -19,8 +19,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 enum layer_names { _BASE, _LOWER, _RAISE, _ADJUST };
 
-enum atlas_keycodes { LOWER = SAFE_RANGE, RAISE };
-
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
 /* Base
@@ -41,7 +39,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC,
   KC_ESC,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,
   KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_ENT,
-  KC_LCTL, KC_LGUI, KC_LALT, KC_LGUI, KC_SPC,  LOWER,   RAISE,   KC_SPC,  KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT
+  KC_LCTL, KC_LGUI, KC_LALT, KC_LGUI, KC_SPC,  TL_LOWR, TL_UPPR, KC_SPC,  KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT
 ),
 
 /* Lower (Better-Shift: shifted alphanumerics)
@@ -107,27 +105,3 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______
 )
 };
-
-bool process_record_user(uint16_t keycode, keyrecord_t *record) {
-    switch (keycode) {
-        case LOWER:
-            if (record->event.pressed) {
-                layer_on(_LOWER);
-                update_tri_layer(_LOWER, _RAISE, _ADJUST);
-            } else {
-                layer_off(_LOWER);
-                update_tri_layer(_LOWER, _RAISE, _ADJUST);
-            }
-            return false;
-        case RAISE:
-            if (record->event.pressed) {
-                layer_on(_RAISE);
-                update_tri_layer(_LOWER, _RAISE, _ADJUST);
-            } else {
-                layer_off(_RAISE);
-                update_tri_layer(_LOWER, _RAISE, _ADJUST);
-            }
-            return false;
-    }
-    return true;
-}

keyboards/cannonkeys/atlas/keymaps/vnz/rules.mk

@@ -2,3 +2,4 @@ COMMAND_ENABLE = no
 CONSOLE_ENABLE = no
 MOUSEKEY_ENABLE = yes
 UNICODEMAP_ENABLE = yes
+TRI_LAYER_ENABLE = yes