chore(build): consolidate packaging inputs and build output layout (#299)

.gitignore

@@ -8,11 +8,6 @@ node_modules/
 # Electron build output
 out/
 dist/
-release/*
-!release/
-!release/release-notes.md
-!release/prerelease-notes.md
-build/yomitan/
 coverage/
 
 # Launcher build artifact (produced by make build-launcher)
@@ -20,8 +15,6 @@ coverage/
 /main-entry.js
 /main-entry.js.map
 
-/build/hachidori/
-
 # Logs
 *.log
 npm-debug.log*
@@ -43,6 +36,7 @@ environment.toml
 .vitepress/dist/
 docs/.vitepress/cache/
 docs/.vitepress/dist/
+# Local test media and scripts
 tests/*
 .worktrees/
 .tmp/