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)):

tests/test_vendor_capabilities.py

@@ -193,3 +193,30 @@ def test_deepseek_wildcard_falls_back_to_v3_defaults() -> None:
  caps = get_capabilities('deepseek', 'deepseek-future-unregistered')
  assert caps.reasoning is True
  assert caps.structured_output is True
+
+def test_v2_capability_badge_helper_contains_all_11_v2_fields() -> None:
+ """The GUI's v2 capability badges should render badges for all
+ 11 v2 fields. This test ensures the helper stays in sync with
+ the v2 matrix."""
+ import src.gui_2
+ import inspect
+ src_lines: str = inspect.getsource(src.gui_2._render_v2_capability_badges)
+ known_v2_fields: list[str] = [
+  "reasoning", "structured_output", "code_execution",
+  "web_search", "x_search", "file_search", "mcp_support",
+  "audio", "video", "grounding", "computer_use",
+ ]
+ for field in known_v2_fields:
+  assert f'"{field}"' in src_lines, f'v2 field {field!r} missing from _render_v2_capability_badges helper'
+
+def test_v2_capability_badge_helper_skips_disabled_fields() -> None:
+ """Sanity: a caps with all v2 fields False should produce no
+ badges. We can verify this by passing a default-constructed
+ VendorCapabilities and asserting the helper returns without
+ erroring. (We can't easily verify the ImGui output without
+ a live context, but we can verify the helper is a no-op on
+ the no-cap case.)"""
+ from src.gui_2 import _render_v2_capability_badges
+ from src.vendor_capabilities import VendorCapabilities
+ empty_caps = VendorCapabilities(vendor='test', model='empty')
+ _render_v2_capability_badges(empty_caps)