invert dependency: internal no longer imports internal/tui

Introduce internal/runtime as a neutral contract package that both the
core engine (internal) and the TUI layer (internal/tui) depend on.

- internal/runtime: defines TraceStarter, StreamSource, EventSink,
  LiveTrieSource, SnapshotSource, ProbeManager, RuntimePublisher,
  RuntimeState, TraceRuntimeBindings, and all context key/helper
  functions (RuntimeBindingsFromContext, RuntimePublisherFromContext,
  ContextWithRuntimeBindings, ContextWithTraceFilters,
  TraceFiltersFromContext). These were previously defined in
  internal/tui, forcing the core package to import the TUI layer.

- internal/streamrow: add RingBuffer (moved from internal/tui/eventstream)
  so the core tracing engine can use the ring buffer without importing
  the TUI layer.

- internal/tui/eventstream/ringbuffer.go: change to a thin re-export of
  streamrow.RingBuffer via a type alias, preserving the existing API for
  all callers within the TUI layer.

- internal/tui/tui.go: replace locally-defined interface declarations
  (TraceStarter, SnapshotSource, ProbeManager, RuntimePublisher,
  RuntimeState, TraceRuntimeBindings) with type aliases from
  internal/runtime. Delegate all context helper functions to runtime.

- internal/ior.go, internal/ior_bpfsetup.go: remove imports of
  internal/tui and internal/tui/eventstream; use internal/runtime and
  internal/streamrow instead. Add SetTUIRunners injection point so the
  concrete TUI runner functions are wired in by cmd/ior/main.go.

- cmd/ior/main.go: call internal.SetTUIRunners with the concrete TUI
  runner functions before internal.Run, completing the wiring without
  creating a cycle.

- Test files (internal/ior_mode_test.go, internal/bench_pipeline_test.go):
  updated to use runtime.* and streamrow.* types in place of tui.* and
  eventstream.* types.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/internal/ior_bpfsetup.go b/internal/ior_bpfsetup.go
index 9ab9186..d5f3be8 100644
--- a/internal/ior_bpfsetup.go
+++ b/internal/ior_bpfsetup.go
@@ -8,8 +8,8 @@ import (
 	appconfig "ior/internal/config"
 	"ior/internal/flags"
 	"ior/internal/probemanager"
+	"ior/internal/runtime"
 	"ior/internal/tracepoints"
-	"ior/internal/tui"
 
 	bpf "github.com/aquasecurity/libbpfgo"
 )
@@ -80,7 +80,7 @@ func setupBPFModule(parentCtx context.Context, cfg flags.Config) (*bpf.Module, *
 	}
 	// setupBPFModule only injects the probe manager; it does not read TUI state,
 	// so RuntimePublisher is the correct narrower interface to use here.
-	if bindings, ok := tui.RuntimePublisherFromContext(parentCtx); ok {
+	if bindings, ok := runtime.RuntimePublisherFromContext(parentCtx); ok {
 		bindings.SetProbeManager(mgr)
 		releaseBindings = func() { bindings.SetProbeManager(nil) }
 	}