chore: biome, deps, other housekeeping (#11)

## 🧰 Changes

- [x] swaps out eslint for biome
- [x] updates our tsconfig to reflect `typescript@5.9`
- [x] `dependabot.yml` cleanup
- [x] updates our deps (see below)

before:

```
Package                Current   Wanted   Latest  Location                            Depended by
@readme/eslint-config   14.7.2   14.7.3   14.7.3  node_modules/@readme/eslint-config  rdme-plugin-template
@types/node             24.0.8   24.3.0   24.3.0  node_modules/@types/node            rdme-plugin-template
eslint                  8.57.1   8.57.1   9.34.0  node_modules/eslint                 rdme-plugin-template
knip                    5.61.3   5.63.0   5.63.0  node_modules/knip                   rdme-plugin-template
oclif                   4.20.1  4.22.14  4.22.14  node_modules/oclif                  rdme-plugin-template
tsx                     4.20.3   4.20.5   4.20.5  node_modules/tsx                    rdme-plugin-template
typescript               5.8.3    5.9.2    5.9.2  node_modules/typescript             rdme-plugin-template
```

after:

```
```

## 🧬 QA & Testing

does everything work as expected?

Author: kanadgupta

.eslintignore

@@ -0,0 +1,2 @@
+* @erunion
+* @kanadgupta

.eslintrc

@@ -4,9 +4,6 @@ updates:
     directory: '/'
     schedule:
       interval: monthly
-    reviewers:
-      - erunion
-      - kanadgupta
     labels:
       - dependencies
     commit-message:
@@ -18,9 +15,6 @@ updates:
     schedule:
       interval: monthly
     open-pull-requests-limit: 10
-    reviewers:
-      - erunion
-      - kanadgupta
     labels:
       - dependencies
     groups:
@@ -32,8 +26,3 @@ updates:
     commit-message:
       prefix: chore(deps)
       prefix-development: chore(deps-dev)
-    ignore:
-      # Blocked on this until we can bump our shared ESLint config to support ESLint 9
-      - dependency-name: eslint
-        versions:
-          - '>= 8'

.github/CODEOWNERS

@@ -0,0 +1,3 @@
+{
+  "recommendations": ["biomejs.biome", "esbenp.prettier-vscode"]
+}

.github/dependabot.yml

@@ -0,0 +1,5 @@
+{
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  // explicitly disable ESLint to avoid conflicts with Biome
+  "eslint.enable": false
+}

.vscode/extensions.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
+  "extends": ["@readme/standards/biome"],
+  "root": true,
+  "files": {
+    "ignoreUnknown": false,
+    "includes": [
+      "**/*.{js,ts}",
+
+      // Biome's `vcs.useIgnoreFile` config should be able to pick these up but it doesn't.
+      "!coverage",
+      "!dist",
+    ],
+  },
+  "linter": {
+    "domains": {
+      // These domains are configured in our core standards package but Biome `extends` seems to
+      // not load it in so we have to redefine them.
+      "project": "all",
+      "test": "all",
+    },
+  },
+}