build(rawcli): make prompt_toolkit a core dependency + document rawcli

`pm3py rawcli` is a headline tool, so prompt_toolkit moves from the
[rawcli] extra into core dependencies — a plain `pip install` gets it and
the command just works. The extra is removed; the missing-module guard now
points at a reinstall (it only fires on a broken env).

README: add the rawcli feature bullet, a dedicated "pm3py rawcli"
section (breadcrumb, entry toggle, identify, function-style commands, live
trace, TLV, completion), prompt_toolkit in the dependency list, and cli/
in the architecture tree.

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

pyproject.toml

@@ -38,11 +38,11 @@ dependencies = [
     "pyserial-asyncio>=0.6",
     "bitarray>=2.0",
     "pycryptodome>=3.10",
+    "prompt_toolkit>=3.0",
 ]
 
 [project.optional-dependencies]
 dev = ["pytest"]
-rawcli = ["prompt_toolkit>=3.0"]
 
 [project.scripts]
 pm3flash = "pm3py.flash_cli:main"