test(cli): pass --yes in the S3 e2e overwrite load (RFC-011 Decision 9) (#265)

The RustFS S3 integration job was red on `local_cli_s3_end_to_end_init_load_read_flow`:
the test runs `load --mode overwrite` against an `s3://` target, which the
RFC-011 Decision 9 destructive-write guard now refuses without `--yes`
("refusing destructive `load --mode overwrite` against non-local target …").

The guard is intended and already covered in cli_data.rs; this test slipped
through because it only runs in the bucket-gated RustFS CI job, not the default
local gate. Add `--yes` to match the established pattern used by the other
overwrite-against-non-local tests in this file (lines ~1305, ~1331).

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

crates/omnigraph-cli/tests/system_local.rs

@@ -640,6 +640,10 @@ fn local_cli_s3_end_to_end_init_load_read_flow() {
             .arg("load")
             .arg("--mode")
             .arg("overwrite")
+            // `--yes` clears the RFC-011 Decision 9 destructive-write
+            // confirmation: `--mode overwrite` against a non-local (s3://)
+            // target is refused without it.
+            .arg("--yes")
             .arg("--data")
             .arg(fixture("test.jsonl"))
             .arg(&graph_uri),