feat(build): add fmt/lint/test tasks

tasks.toml

@@ -1,4 +1,4 @@
-[dev]
+["dev"]
 run = 'mise dev:tmux'
 
 ["dev:tmux"]
@@ -8,3 +8,39 @@ run = [
     'tmux split-window "cd frontend; bun install; PORT=8913 bun src/index.tsx"',
     'sleep 0.1 && (xdg-open "http://localhost:8913" || open "http://localhost:8913")'
 ]
+
+["format"] # fmt collides with built-in `mise fmt`
+run = [
+  'mise format:backend',
+  'mise format:frontend'
+]
+
+["format:backend"]
+run = 'gofmt -w backend/'
+
+["format:frontend"]
+run = 'bun --cwd frontend eslint --fix'
+
+["test"]
+run = [
+  'mise test:backend',
+  'mise test:frontend'
+]
+
+["test:backend"]
+run = 'echo TODO > /dev/null'
+
+["test:frontend"]
+run = 'bun test'
+
+["lint"]
+run = [
+  'mise lint:backend',
+  'mise lint:frontend'
+]
+
+["lint:backend"]
+run = 'echo TODO > /dev/null'
+
+["lint:frontend"]
+run = 'bun --cwd frontend eslint'