diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..0fc4431
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,6 @@
+* text=auto eol=lf
+*.bat text eol=crlf
+*.png binary
+*.ogg binary
+*.jar binary
+*.zip binary
diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 2d22e85..256e545 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,5 +1,6 @@
 Power Advantage 2.4.4.113021
 
+- Exclude empty directories so development jars match between existing workspaces and fresh CI checkouts.
 - Port Power Advantage to Minecraft 1.13.2 with ForgeGradle 7 and Java 8 support.
 - Keep existing block, item, fluid and saved-state names, the legacy public API and Iron Age Furniture compatibility facades.
 - Add direct 1.10 and 1.12 world migration, including inventories, fluids, entities, pets, enchantments and old configuration files. Back up worlds before upgrading.
diff --git a/README.md b/README.md
index be8107c..a59588c 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ Both the original Windows-input jar and a clean LF-checkout build have exact
 checksums in `gradle.properties`. Their class bytes and archive entries match;
 only text line endings differ. CI uses the LF build. Unknown hashes still fail.
 Advantage's own archives normalize text to LF.
+All Advantage archives also exclude empty directories left behind by older source layouts.
 
 Release jars are written to `build/libs`; `deobfJar` writes the sibling-development jar to `build/libs-dev`.
 
diff --git a/build.gradle b/build.gradle
index 2ef7220..3c74089 100644
--- a/build.gradle
+++ b/build.gradle
@@ -70,6 +70,7 @@ tasks.withType(Javadoc).configureEach {
 }
 
 tasks.withType(AbstractArchiveTask).configureEach {
+    includeEmptyDirs = false
     preserveFileTimestamps = false
     reproducibleFileOrder = true
 }
@@ -369,7 +370,7 @@ tasks.register('verifyReleaseConfiguration') {
                 throw new GradleException("Persistent tile entity id changed or disappeared: ${id}")
             }
         }
-        String modsToml = file('src/main/resources/META-INF/mods.toml').getText('UTF-8')
+        String modsToml = file('src/main/resources/META-INF/mods.toml').getText('UTF-8').replace('\r\n', '\n')
         ['modId="poweradvantage"', 'modId="basemetals"', 'modId="orespawn"',
          'mandatory=true'].each { required ->
             if (!modsToml.contains(required)) {
@@ -470,6 +471,17 @@ tasks.register('verifyReleaseArtifacts') {
         if (jars.collect { it.name } != expected) {
             throw new GradleException("Expected exactly ${expected}, found ${jars.collect { it.name }}")
         }
+        // Empty source directories survive branch changes but are absent in fresh clones.
+        (jars + [tasks.named('jar', Jar).get().archiveFile.get().asFile]).each { candidate ->
+            new ZipFile(candidate).withCloseable { zip ->
+                List entries = zip.entries().toList()
+                entries.findAll { it.isDirectory() }.each { directory ->
+                    if (!entries.any { !it.isDirectory() && it.name.startsWith(directory.name) }) {
+                        throw new GradleException("${candidate.name} contains empty directory ${directory.name}")
+                    }
+                }
+            }
+        }
         jars.each { candidate ->
             if (candidate.length() == 0L) {
                 throw new GradleException("Empty release artifact: ${candidate.name}")
diff --git a/test-rig/profiles/dev-core-apocalyptic.json b/test-rig/profiles/dev-core-apocalyptic.json
index 317fcd2..39d2ce4 100644
--- a/test-rig/profiles/dev-core-apocalyptic.json
+++ b/test-rig/profiles/dev-core-apocalyptic.json
@@ -24,7 +24,7 @@
       "version": "2.2.5.113021",
       "file": "SteamAdvantage-2.2.5.113021-deobf.jar",
       "path": "../../SteamAdvantage/SteamAdvantage/build/libs-dev/SteamAdvantage-2.2.5.113021-deobf.jar",
-      "sha256": "5F381C5FD50B3C22BC3531B4D3D7160AF26F703711F360AF8FAD4530BAF21E37"
+      "sha256": "CD0FF2C4F79484211DF3BBF1CA63F48C43620FEB764390FAC614AD3DDE0AF5C3"
     },
     {
       "id": "electricadvantage",
diff --git a/test-rig/profiles/dev-core-tech-progression.json b/test-rig/profiles/dev-core-tech-progression.json
index 85ecec9..2374298 100644
--- a/test-rig/profiles/dev-core-tech-progression.json
+++ b/test-rig/profiles/dev-core-tech-progression.json
@@ -24,7 +24,7 @@
       "version": "2.2.5.113021",
       "file": "SteamAdvantage-2.2.5.113021-deobf.jar",
       "path": "../../SteamAdvantage/SteamAdvantage/build/libs-dev/SteamAdvantage-2.2.5.113021-deobf.jar",
-      "sha256": "5F381C5FD50B3C22BC3531B4D3D7160AF26F703711F360AF8FAD4530BAF21E37"
+      "sha256": "CD0FF2C4F79484211DF3BBF1CA63F48C43620FEB764390FAC614AD3DDE0AF5C3"
     },
     {
       "id": "electricadvantage",
diff --git a/test-rig/profiles/dev-core.json b/test-rig/profiles/dev-core.json
index 563995e..9cec5cb 100644
--- a/test-rig/profiles/dev-core.json
+++ b/test-rig/profiles/dev-core.json
@@ -23,7 +23,7 @@
       "version": "2.2.5.113021",
       "file": "SteamAdvantage-2.2.5.113021-deobf.jar",
       "path": "../../SteamAdvantage/SteamAdvantage/build/libs-dev/SteamAdvantage-2.2.5.113021-deobf.jar",
-      "sha256": "5F381C5FD50B3C22BC3531B4D3D7160AF26F703711F360AF8FAD4530BAF21E37"
+      "sha256": "CD0FF2C4F79484211DF3BBF1CA63F48C43620FEB764390FAC614AD3DDE0AF5C3"
     },
     {
       "id": "electricadvantage",