Graph: name the interpreter when pytriskel is missing

./ida-tui runs $IDATUI_PYTHON (default ~/ida-venv), which is not the
repo .venv the tests use -- so the graph view can report pytriskel as
missing while tests/test_graph.py is exercising both engines. "not
installed" on its own sends you to check the wrong python; the status
now names sys.executable, and docs/GRAPH_VIEW.md says to install into
both.

2 files changed, 17 insertions, 2 deletions

diff --git a/docs/GRAPH_VIEW.md b/docs/GRAPH_VIEW.md
index ea1f84d..d588b3d 100644
--- a/docs/GRAPH_VIEW.md
+++ b/docs/GRAPH_VIEW.md
@@ -217,10 +217,20 @@ drive raw graph action=zoom
 
 It is optional; without it everything works and `auto` means `native`.
 
+**Install it into the interpreter the launcher actually runs**, which is
+`$IDATUI_PYTHON` and defaults to `~/ida-venv/bin/python` — *not* the repo's
+`.venv`, which is only what the tests use. Getting this wrong is the one way to
+see `no pytriskel in ...` in the status bar while `tests/test_graph.py` happily
+exercises both engines; the message names the interpreter for that reason.
+
 ```bash
-uv pip install ~/dev/triskel/bindings/python    # needs cmake, ninja, a C++23 compiler
+~/ida-venv/bin/python -m pip install ~/dev/triskel/bindings/python
+.venv/bin/python   -m pip install ~/dev/triskel/bindings/python   # for the tests
 ```
 
+Needs cmake, ninja and a C++23 compiler at install time; the wheel is built from
+source for whichever interpreter runs pip.
+
 That is **our fork**, not PyPI. Upstream's wheels stop at cp313 with no sdist
 (so there is nothing to install on 3.14), and on any version their
 `get_waypoints()` raises, which means no edge routes at all. `~/dev/triskel/PATCHES.md`
diff --git a/idatui/app.py b/idatui/app.py
index 76aff62..b2b1722 100644
--- a/idatui/app.py
+++ b/idatui/app.py
@@ -20,6 +20,7 @@ import asyncio
 import os
 import re
 import subprocess
+import sys
 import time
 from dataclasses import dataclass, field
 from enum import StrEnum
@@ -2679,7 +2680,11 @@ class GraphView(NavMixin, ScrollView, can_focus=True):
         self._center_cursor()
         self.refresh(layout=True)
         got = self.lay.stats["engine"] if self.lay else "?"
-        note = "" if graph_triskel.available() else " (pytriskel not installed)"
+        # Name the interpreter. The launcher runs $IDATUI_PYTHON (default
+        # ~/ida-venv), which is NOT the repo .venv the tests use, so "not
+        # installed" on its own sends people to check the wrong python.
+        note = ("" if graph_triskel.available()
+                else f" (no pytriskel in {sys.executable})")
         self.app._status(f"graph: engine {self._engine} \u2192 {got}{note}")
 
     def action_center(self) -> None: