Fix smoke-test JSONC parsing to respect URLs

The previous 'sed "s|//.*$||"' approach greedily stripped '//' from
URLs like https://mcp.context7.com/mcp, corrupting the JSON and causing
smoke-test failures with json.decoder.JSONDecodeError. Replaced the sed
step with a Python regex that respects string literals so URLs pass
through while only line comments are removed.

scripts/smoke-test.sh

@@ -175,11 +175,14 @@ if docker run --rm \
       python3 /usr/local/lib/opencode-devbox/generate-config.py 2>/dev/null
       cat /tmp/home/.config/opencode/opencode.jsonc
     ' > "$tmp/out.jsonc" 2>/dev/null; then
-  # Strip single-line // comments for JSON validation
-  sed 's|//.*$||' "$tmp/out.jsonc" > "$tmp/out.json"
+  # Strip single-line // comments for JSON validation (respecting strings)
   if python3 -c "
-import json, sys
-c = json.load(open('$tmp/out.json'))
+import re, json, sys
+text = open('$tmp/out.jsonc').read()
+# Match either a string literal or a // comment; keep strings, drop comments
+pattern = r'\"(?:\\\\.|[^\"\\\\])*\"|//[^\n]*'
+stripped = re.sub(pattern, lambda m: m.group(0) if m.group(0).startswith('\"') else '', text)
+c = json.loads(stripped)
 assert c['model'].startswith('anthropic/'), c
 assert c['autoupdate'] is False
 assert c['share'] == 'disabled'