diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..fa4f746
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Beomjin Kim
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index f2e5e94..397c6d6 100644
--- a/README.md
+++ b/README.md
@@ -17,12 +17,18 @@ Open `http://localhost:8080/experiments/csv-preflight/` when serving from the re
 ### Free command-line check
 
 Node.js 20 or newer can run the same generic structural preflight on one local file without a
-browser or dependency install:
+browser. The repository copy works without an install:
 
 ```sh
 node cli.mjs input.csv --output normalized.csv --report issues.csv
 ```
 
+Version 0.6.0 prepares the same command for npm publication:
+
+```sh
+npx csv-preflight input.csv --output normalized.csv --report issues.csv
+```
+
 The free CLI returns exit 0 for a clean file, 1 for reported issues or rejected input, and 2 for an
 invocation/runtime error. It accepts UTF-8 input up to 10 MiB and refuses to overwrite the input or
 an existing output. It does not include the Pro archive's batch, Shopify-profile, ZIP, or JSON
diff --git a/a75acc2ed5874b344f9f70acb44713d4.txt b/a75acc2ed5874b344f9f70acb44713d4.txt
new file mode 100644
index 0000000..45b5032
--- /dev/null
+++ b/a75acc2ed5874b344f9f70acb44713d4.txt
@@ -0,0 +1 @@
+a75acc2ed5874b344f9f70acb44713d4
diff --git a/cli.mjs b/cli.mjs
index e2a43d1..d3d4ad7 100644
--- a/cli.mjs
+++ b/cli.mjs
@@ -148,10 +148,11 @@ export function runCli(argv, io = {}) {
       issues = [{ type: "encoding", row: null, detail: `${detected.encoding} is not supported; export as UTF-8` }];
     } else {
       const text = new TextDecoder("utf-8", { fatal: true }).decode(bytes.slice(detected.offset));
-      const result = analyze(text);
+      const delimiter = guessDelimiter(text);
+      const result = analyze(text, delimiter);
       issues = result.issues;
       if (!issues.some(issue => issue.type === "parse" || issue.type === "empty")) {
-        normalized = new TextEncoder().encode(`\uFEFF${serializeCsv(result.cleanRows)}`);
+        normalized = new TextEncoder().encode(`\uFEFF${serializeCsv(result.cleanRows, delimiter)}`);
       }
     }
     const targets = normalized ? [config.output, config.report] : [config.report];
diff --git a/cli.test.mjs b/cli.test.mjs
index bea25d2..f93d6c6 100644
--- a/cli.test.mjs
+++ b/cli.test.mjs
@@ -36,6 +36,19 @@ test("free CLI writes a clean normalized file and report", () => {
   assert.match(new TextDecoder().decode(writes[1].data), /type,row,detail/);
 });
 
+test("free CLI preserves the detected delimiter in normalized output", () => {
+  const writes = [];
+  const exit = runCli(["input.csv", "--output", "clean.csv", "--report", "report.csv"], {
+    readFile: () => bytes("name;price\nMug;12"),
+    outputExists: () => false,
+    writeFile: (file, data) => writes.push({ file, data }),
+    stdout: () => {},
+    stderr: () => {},
+  });
+  assert.equal(exit, 0);
+  assert.match(new TextDecoder().decode(writes[0].data), /name;price\r\nMug;12/);
+});
+
 test("free CLI reports warnings and withholds rejected output", () => {
   const warningWrites = [];
   const common = { outputExists: () => false, stdout: () => {}, stderr: () => {} };
diff --git a/package.json b/package.json
index 47dbba9..23742de 100644
--- a/package.json
+++ b/package.json
@@ -1 +1,39 @@
-{"type":"module","scripts":{"test":"node --test","benchmark":"node benchmark.mjs","benchmark:record":"node benchmark.mjs --write"},"engines":{"node":"22.x"},"private":true}
+{
+  "name": "csv-preflight",
+  "version": "0.6.0",
+  "description": "Check one CSV for structural problems before import",
+  "type": "module",
+  "bin": {
+    "csv-preflight": "cli.mjs"
+  },
+  "files": [
+    "cli.mjs",
+    "LICENSE"
+  ],
+  "scripts": {
+    "test": "node --test",
+    "benchmark": "node benchmark.mjs",
+    "benchmark:record": "node benchmark.mjs --write",
+    "prepack": "npm test"
+  },
+  "engines": {
+    "node": ">=20"
+  },
+  "keywords": [
+    "csv",
+    "validator",
+    "cli",
+    "data-quality",
+    "preflight"
+  ],
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/softpeanut/csv-preflight.git"
+  },
+  "homepage": "https://softpeanut.github.io/csv-preflight/",
+  "bugs": "https://github.com/softpeanut/csv-preflight/issues",
+  "publishConfig": {
+    "access": "public"
+  }
+}