feat(opencode): allow bash on yolo only

Global config keeps bash at "ask", which stalls every unattended opencode
session on git and grep. yolo runs the PR daemon's reviewers, so the prompt
is a deadlock there rather than a gate.

Merges like claude-settings.json: home/yolo/opencode.json holds only the
override, so agents, commands and skills still come from common. Reviewers
run on branches under review, so this drops that prompt too.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

home/yolo/opencode.json

@@ -0,0 +1,5 @@
+{
+  "permission": {
+    "bash": "allow"
+  }
+}