Add editor, ignore, and prettier configuration

.dockerignore

@@ -0,0 +1,9 @@
+.git
+node_modules
+.DS_Store
+/sutil
+*.test
+*.out
+*.log
+*.prof
+coverage.*

.editorconfig

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+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

.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.*

.prettierignore

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+node_modules/
+yarn.lock

.prettierrc

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+{
+    "tabWidth": 4,
+    "proseWrap": "always"
+}

package.json

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+{
+    "name": "x",
+    "private": true,
+    "description": "prettier is used by `make fmt` and `make fmt-check` to format markdown",
+    "devDependencies": {
+        "prettier": "3.9.10"
+    }
+}

yarn.lock

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+# 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==