feat(gui): add v2 capability badges in provider panel

Phase 5 t5_4 (UI adaptations for 11 v2 fields): the simplest
honest adaptation — render small colored badges for the 11
v2 fields where the active vendor+model supports them. Each
badge has a tooltip showing the field name.

The 11 fields:
  reasoning, structured_output, code_execution, web_search,
  x_search, file_search, mcp_support, audio, video,
  grounding, computer_use

A new module-level function _render_v2_capability_badges(caps)
is added to src/gui_2.py (per the HARD RULE on no new
src/<thing>.py files). It's called from render_provider_panel
right after the existing '[Local]' badge (which uses the
runtime override for caps.local).

What this is NOT: a full UI for the 11 fields (per-field
toggles, panels, attachment buttons). Those are design-heavy
work and need their own track. This change gives the user
visibility into which capabilities the active vendor+model
supports, so they can make informed decisions about which
prompts/features to use.

For example, when the user selects qwen-audio, they'll see:
  Provider: qwen [Local]  Capabilities [Audio]
Which makes it obvious they can attach audio files.

Tests:
- 2 new tests in tests/test_vendor_capabilities.py:
  * All 11 v2 fields are present in the helper (drift guard)
  * Helper is a no-op on empty caps (no fields True)
- 118/118 vendor+tool+provider+import-isolation tests pass
  (no regressions; +2 new tests this commit)
- 3 audit scripts pass

src/gui_2.py

@@ -258,6 +258,47 @@ def _apply_runtime_caps_override(app: "App", caps: "VendorCapabilities") -> "Ven
    return replace(caps, local=True)
  return caps
 
+
+def _render_v2_capability_badges(caps: "VendorCapabilities") -> None:
+ """Render small colored badges for the 11 v2 capability flags.
+
+ Only fields where caps.<field> is True are shown. Each badge
+ has a tooltip with the field name. Per-field colors map to
+ the existing theme convention: green for supported, grey for
+ not. Fields with no entry (False) are silently omitted.
+
+ Added 2026-06-11 as part of Phase 5 t5_4 (UI adaptations for
+ new v2 fields). The 11 fields are the v2 matrix fields beyond
+ the original 7 v1 fields (vision, tool_calling, caching,
+ streaming, model_discovery, context_window, cost_tracking)
+ which are already gated elsewhere in the GUI.
+ [C: src/gui_2.py:render_provider_panel]
+"""
+ badged_fields: list[tuple[str, str]] = [
+  ("reasoning", "Reasoning"),
+  ("structured_output", "JSON"),
+  ("code_execution", "Code"),
+  ("web_search", "Web"),
+  ("x_search", "X"),
+  ("file_search", "File"),
+  ("mcp_support", "MCP"),
+  ("audio", "Audio"),
+  ("video", "Video"),
+  ("grounding", "Ground"),
+  ("computer_use", "Comp"),
+ ]
+ enabled: list[tuple[str, str]] = []
+ for field_name, label in badged_fields:
+  if getattr(caps, field_name, False):
+   enabled.append((field_name, label))
+ if not enabled:
+  return
+ imgui.text("Capabilities")
+ for field_name, label in enabled:
+  imgui.same_line()
+  imgui.text_colored(theme.get_color("status_success"), f" [{label}]")
+  if imgui.is_item_hovered():
+   imgui.set_tooltip(f"caps.{field_name}=True")
 class App:
  """The main ImGui interface orchestrator for Manual Slop."""
 
@@ -2334,6 +2375,7 @@ def render_provider_panel(app: App) -> None:
    if app.current_provider == "llama":
     base_url = getattr(ai_client, "_llama_base_url", "")
    imgui.set_tooltip(f"Local backend: {base_url or 'unknown'}" if base_url else "Local backend")
+ _render_v2_capability_badges(caps)
  imgui.separator()
  imgui.text("Model")
  if imgui.begin_list_box("##models", imgui.ImVec2(-1, 120)):