feat: add stat completion source

Implement a new completion source that extracts stat definitions
from markdown files using `yaml` or `csv` code blocks with
`role=stat`.

src/components/journal-doc-data.ts

@@ -43,8 +43,9 @@ function parseEntry(raw: string): JournalDocEntry | null {
 
 import journalGmRaw from "../doc-entries/journal-gm.md";
 import journalPlayerRaw from "../doc-entries/journal-player.md";
+import journalStatRaw from "../doc-entries/journal-stat.md";
 
-const rawDocuments: string[] = [journalGmRaw, journalPlayerRaw];
+const rawDocuments: string[] = [journalGmRaw, journalPlayerRaw, journalStatRaw];
 
 let _entries: JournalDocEntry[] | null = null;