fix(github): require a handle boundary after @gittensory in mention parsing

src/github/commands.ts

@@ -162,7 +162,10 @@ export type MaintainerQueueDigest = {
 
 export function parseGittensoryMentionCommand(body: string | null | undefined): GittensoryMentionCommand | null {
   if (!body) return null;
-  const match = body.match(/(?:^|\s)@gittensory(?:\s+([a-z-]+))?([^\n\r]*)/i);
+  // `(?![\w-])` keeps the handle from matching as a PREFIX of a longer GitHub username: a comment that
+  // mentions a different account like `@gittensory-bot` / `@gittensory2` must NOT be parsed as a bare
+  // `@gittensory help`. GitHub usernames are word chars + hyphen, so the boundary excludes both.
+  const match = body.match(/(?:^|\s)@gittensory(?![\w-])(?:\s+([a-z-]+))?([^\n\r]*)/i);
   if (!match) return null;
   const requested = (match[1]?.toLowerCase() || "help") as GittensoryMentionCommandName | GittensoryActionCommandName;
   if (ACTION_COMMANDS.has(requested as GittensoryActionCommandName)) {

test/unit/github-commands.test.ts

@@ -39,6 +39,13 @@ describe("GitHub mention commands", () => {
       reason: "known false positive, shipping",
     });
     expect(parseGittensoryMentionCommand("gittensory preflight")).toBeNull();
+    // A mention of a DIFFERENT account whose handle merely starts with "gittensory" must not be parsed as a
+    // bare @gittensory command (GitHub never resolves @gittensory-bot to @gittensory).
+    expect(parseGittensoryMentionCommand("@gittensory-bot please take a look")).toBeNull();
+    expect(parseGittensoryMentionCommand("@gittensory2 ping")).toBeNull();
+    expect(parseGittensoryMentionCommand("@gittensorybot ask q")).toBeNull();
+    // ...but real punctuation/whitespace boundaries after the handle still parse.
+    expect(parseGittensoryMentionCommand("@gittensory, preflight please")?.name).toBe("help");
     expect(isMaintainerOnlyCommand("queue-summary")).toBe(true);
     expect(isMaintainerOnlyCommand("preflight")).toBe(false);
   });