chore: gitignore backend/vendor, drop stale pkg/queue doc row, self-contained test messages

- Ignore the local `backend/vendor/` tree (187 MB, present only for the
  vendored-fork build) so it can't be accidentally staged.
- Remove the architecture-table row for `pkg/queue/`, which was deleted when
  the container stat fan-out moved to errgroup.
- Drop the internal "H4" report-id labels from the telemetry test — the
  sentences already say what they guard.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -7,6 +7,7 @@
 
 backend/tmp
 backend/build
+backend/vendor
 
 frontend/coverage
 frontend/dist

CLAUDE.md

@@ -77,7 +77,6 @@ The full stack runs at `https://localhost:8443` when using Docker Compose. Copy
 | `pkg/tools/` | Penetration testing tool integrations |
 | `pkg/docker/` | Docker SDK wrapper for sandboxed container execution |
 | `pkg/terminal/` | Terminal session and command execution management |
-| `pkg/queue/` | Async task queue |
 | `pkg/csum/` | Chain summarization for LLM context management |
 | `pkg/graphiti/` | Knowledge graph (Neo4j via Graphiti) integration |
 | `pkg/observability/` | OpenTelemetry tracing, metrics, structured logging |

backend/pkg/observability/otelclient_test.go

@@ -76,7 +76,7 @@ func TestNewTelemetryClient_SuccessPathExportsAndShutsDown(t *testing.T) {
 	}
 }
 
-// H4 guard: a set-but-unreachable collector must not hang startup. The endpoint
+// A set-but-unreachable collector must not hang startup. The endpoint
 // accepts the TCP connection but never completes the gRPC handshake, so a
 // WithBlock dial would wait forever without the internal DefaultDialTimeout that
 // this bounds — the caller's context has no deadline.
@@ -110,6 +110,6 @@ func TestNewTelemetryClient_UnreachableReturnsWithinDialTimeout(t *testing.T) {
 			t.Fatal("expected an error for an unreachable collector")
 		}
 	case <-time.After(DefaultDialTimeout + 10*time.Second):
-		t.Fatal("NewTelemetryClient hung past the dial timeout (H4 regression)")
+		t.Fatal("NewTelemetryClient hung past the dial timeout")
 	}
 }