chore: gitignore nested agents/ subdir

The pyrycode-relay-agents repo is checked out at agents/ inside this
repo (matches pyrycode/agents inside pyrycode/pyrycode). It has its
own remote and is not tracked here. This mirrors the existing layout
that the dispatcher's resolvePyrycodeRepoRoot expects.

Author: ilmoniemi

.gitignore

@@ -22,3 +22,6 @@ go.work.sum
 # OS
 .DS_Store
 Thumbs.db
+
+# Nested agents repo (pyrycode/pyrycode-relay-agents) — gitignored here, lives in its own repo
+agents/