fix: unbreak Postgres integration suite allow-repo config

The multi-owner collision guard added in 5404e24 rejects wildcard
owners in --allow-repo, so the integration compose file's '*/*' rule
made ccg-server refuse to start and the suite fail before any test
phase. Pin the rule to the suite's Gitea admin account (testadmin/*)
and ignore the suite's default artifacts/ output directory.

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

Author: tae2089

.gitignore

@@ -29,3 +29,4 @@ pyproject.toml
 /container-artifacts/
 search-retrieval.md
 _workspace/
+/artifacts/

docker-compose.integration.yml

@@ -67,7 +67,7 @@ services:
       - --http-bearer-token=test-mcp-token
       - --db-driver=postgres
       - --db-dsn=host=postgres user=ccg password=ccg dbname=ccg_integration port=5432 sslmode=disable
-      - --allow-repo=*/*
+      - --allow-repo=testadmin/*
       - --webhook-secret=test-webhook-secret
       - --repo-clone-base-url=http://gitea:3000
       - --repo-root=/repos