chore: project setup and tooling cleanup (#26)

* add project setup

* add tools to eslint

* remove contributing.md

* update claude md

* chore: simplify CI to single Node.js version (22)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* use node 20

* adjust formatting

* fix linting

* format

* fix layout

* fix: align CI node version to .nvmrc (22), remove redundant gotcha

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: arkon <arkon.85@hotmail.com>

src/utils/stale-expiration-map.ts

@@ -245,29 +245,23 @@ export class StaleExpirationMap<K, V> implements Disposable {
   /**
    * Get all keys (non-expired).
    */
-  keys(): IterableIterator<K> {
-    const self = this;
-    return (function* () {
-      for (const [key, entry] of self.entries) {
-        if (!self.isExpired(entry)) {
-          yield key;
-        }
+  *keys(): IterableIterator<K> {
+    for (const [key, entry] of this.entries) {
+      if (!this.isExpired(entry)) {
+        yield key;
       }
-    })();
+    }
   }
 
   /**
    * Get all values (non-expired).
    */
-  values(): IterableIterator<V> {
-    const self = this;
-    return (function* () {
-      for (const [, entry] of self.entries) {
-        if (!self.isExpired(entry)) {
-          yield entry.value;
-        }
+  *values(): IterableIterator<V> {
+    for (const [, entry] of this.entries) {
+      if (!this.isExpired(entry)) {
+        yield entry.value;
       }
-    })();
+    }
   }
 
   /**