diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..f850155
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,9 @@
+.git
+node_modules
+.DS_Store
+/sutil
+*.test
+*.out
+*.log
+*.prof
+coverage.*
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..2fe0ce0
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,12 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab
diff --git a/.gitignore b/.gitignore
index 8d206c8..9296457 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,29 @@
-/x
+# OS
+.DS_Store
+Thumbs.db
+
+# Editors
+*.swp
+*.swo
+*~
+*.bak
+.idea/
+.vscode/
+*.sublime-*
+
+# Node (prettier for markdown formatting)
+node_modules/
+
+# Environment / secrets
+.env
+.env.*
+*.pem
+*.key
+
+# Go build and test artifacts
+/sutil
+*.test
+*.out
+*.log
+*.prof
+coverage.*
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..23d67fc
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,2 @@
+node_modules/
+yarn.lock
diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..8af31cd
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,4 @@
+{
+    "tabWidth": 4,
+    "proseWrap": "always"
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..a54c71d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,8 @@
+{
+    "name": "x",
+    "private": true,
+    "description": "prettier is used by `make fmt` and `make fmt-check` to format markdown",
+    "devDependencies": {
+        "prettier": "3.9.10"
+    }
+}
diff --git a/yarn.lock b/yarn.lock
new file mode 100644
index 0000000..3f302a3
--- /dev/null
+++ b/yarn.lock
@@ -0,0 +1,8 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+prettier@3.9.10:
+  version "3.9.10"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.9.10.tgz#ac378e432f1a7381518f2e080816bbaefa38d585"
+  integrity sha512-skGHTH1Yb9QvaTC4hWnRTzEYtCpApF0UMBPz+t/0ZPzP8ihefo/btKd+QA7pUE0fEwA1SbS/NmhyEcstdXOIdA==