feat(cli): add terminal stats dashboard and solution detection utilities

apps/cli/work.ts

@@ -93,6 +93,25 @@ export function scanBucket(bucket: Bucket): Map<number, WorkFile[]> {
   return files;
 }
 
+/**
+ * Is this file a real solution rather than an empty scaffold? The same call
+ * close-solved.ts makes before it closes an issue — a stub under work/1 is a
+ * problem still unsolved, and owes no review.
+ */
+export function isSolution(file: WorkFile): boolean {
+  const source = readFileSync(join(WORK, file.rel), "utf8");
+  return isImplemented(source, file.rel.endsWith(".py") ? "py" : "js");
+}
+
+/** Problems in a bucket with a solution on disk; scaffolds do not count. */
+export function solvedInBucket(bucket: Bucket): number {
+  let solved = 0;
+  for (const files of scanBucket(bucket).values()) {
+    if (files.some(isSolution)) solved++;
+  }
+  return solved;
+}
+
 /**
  * LC number -> ET date of the commit that first added a work/ file for it.
  *
@@ -153,14 +172,12 @@ export function reviewQueues(today: string): Map<Window, Owed[]> {
   const dates = firstSolved();
 
   // An empty scaffold under work/1 is a problem still unsolved, not one owing
-  // a review — the same call close-solved.ts makes before it closes an issue.
+  // a review.
   const solved: { file: WorkFile; date: string }[] = [];
   for (const files of scanBucket(1).values()) {
     const date = dates.get(files[0]!.lc);
     if (date === undefined) continue; // uncommitted: you only just solved it
-    const file = files.find((f) =>
-      isImplemented(readFileSync(join(WORK, f.rel), "utf8"), f.rel.endsWith(".py") ? "py" : "js"),
-    );
+    const file = files.find(isSolution);
     if (file) solved.push({ file, date });
   }