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Phase 2 of PRD 0014. New module claude_bottle/backend/docker/cred_proxy_apply.py: - fetch_current_routes(slug): docker exec cat of the live routes.json from the running cred-proxy sidecar. - validate_routes_json(content): syntactic check before SIGHUP so failures keep the old routes live and surface a clearer error than 'reload failed' in the sidecar logs. - apply_routes_change(slug, new): fetch current → validate new → write to temp → docker cp into sidecar → docker kill --signal HUP. Returns (before, after) so the caller can render a real audit diff. - CredProxyApplyError: caller surfaces to operator without crashing the dashboard. docker exec / cp / kill paths are covered by the integration test in Phase 5; unit tests here cover the validator. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>