test(rawcli): guard Ctrl-t breadcrumb flips 0x<->0b + redraw

Closes the last loose end from the byte-line autocomplete fix: the entry-mode toggle
correctly flips the breadcrumb prefix (0x <-> 0b) and requests a redraw. Adds
test_toggle_updates_breadcrumb_prefix and updates the roadmap.

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

docs/rawcli-todo.md

@@ -23,8 +23,10 @@ appends (optionally after an auto-space) or drops, so the change is always a pur
 key handler: the menu now populates on every digit in both modes. Regression:
 `TestKeyBindings::test_digit_binding_fires_completion_trigger_for_raw_bytes`.
 
-Still worth a quick live-REPL eyeball with a tag on the antenna, and confirming the Ctrl-t / Ctrl-_
+The Ctrl-t / Ctrl-_ toggle correctly flips the breadcrumb `0x` <-> `0b` and requests a redraw
-toggle flips the breadcrumb to `0b` (separate from the completion trigger, not yet re-verified).
+(verified, guarded by `test_toggle_updates_breadcrumb_prefix`). An end-to-end live-session test
+(`TestRawcliLiveSession`) drives the real PromptSession via a pipe input. A human eyeball of the
+rendered dropdown on a real terminal is the only thing left unautomated.
 
 ## Priority 1 — MIFARE Classic (do this first)
 

tests/test_rawcli.py

@@ -886,6 +886,26 @@ class TestKeyBindings:
         toggle.handler(event)
         assert s.entry_mode == "bin" and buf.text == "30"           # mode flipped, buffer intact
 
+    def test_toggle_updates_breadcrumb_prefix(self):
+        # the toggle flips the breadcrumb entry prefix 0x <-> 0b and requests a redraw
+        from types import SimpleNamespace
+        from prompt_toolkit.key_binding import KeyBindings
+        from prompt_toolkit.buffer import Buffer
+        from pm3py.cli.rawcli.entry import install_key_bindings
+        s = RawSession()
+        kb = KeyBindings()
+        install_key_bindings(kb, s)
+        toggle = next(b for b in kb.bindings
+                      if getattr(b.keys[0], "value", b.keys[0]) in ("c-t", "c-_"))
+        redraws = []
+        ev = SimpleNamespace(current_buffer=Buffer(), data="",
+                             app=SimpleNamespace(invalidate=lambda: redraws.append(1)))
+        assert "0x" in s.breadcrumb() and "0b" not in s.breadcrumb()
+        toggle.handler(ev)
+        assert "0b" in s.breadcrumb() and s.entry_prefix == "0b" and redraws   # flipped + redraw
+        toggle.handler(ev)
+        assert "0x" in s.breadcrumb() and "0b" not in s.breadcrumb()           # and back
+
     def test_digit_binding_tracks_per_byte_base(self):
         # replay keystrokes through the real digit binding: 30 (hex) then binary -> 30 00000100
         from types import SimpleNamespace