Report the running build's version to the master

The version is the checkout's HEAD commit (short hash + commit time),
read once at startup — updates arrive as `git pull`, so there is no
release number to bump. It rides on the socket hello, socket reports,
and the HTTP report fallback; the field is optional in the protocol so
older masters ignore it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/reporter.ts

@@ -13,6 +13,7 @@
 
 import { getSetting } from './db';
 import { pushReport } from './master-link';
+import { getBuildVersion } from './version';
 import { getClients } from './clients';
 import { getTradableFirms } from './firm-catalog';
 import { getAccountConfig } from './account-type-resolver';
@@ -292,6 +293,7 @@ export async function sendReport(): Promise<void> {
                 id: getSetting('instance_id') || undefined,
                 firms,
                 scheduler,
+                version: getBuildVersion() ?? undefined,
             }),
         });
     } catch {