[saworbit]

The soak that gave project_set_input_action, signal_connect and scene_create a file route (#1467, #1468, #1469) settled each format question with throwaway Godot probes. This keeps them as probes, each taking its engines on the command line, and logs the session in tools/vibe/README.md.

Probe	What it keeps
scene_connection_engine.py	The editor's [connection] spelling for flags 2, 3 and 6 and an unbound callable, what a loaded file keeps of a bad signal, method or emitter, and connections written through the server then loaded (#1387).
scene_root_engine.py	Every constructible Node class as a root-only scene against the two-line file, a root's name through Node.set_name and through a hand-written line, a MissingNode root (#1471) and a 4.7-only root on older lines (#1472).
offline_scene_create.py	Twenty-six scenes written by the server with no editor, then scanned by the editor and loaded, each checked against the engine's own line, name and uid (#1380).
input_action_literal.py	The server's [input] text against the engine's own route for the same events, once an engine has loaded and saved it (#1379).
ext_resource_type_engine.py	How a scene names an imported PNG and WAV, and what a malformed uid beside a real path does (#1461, #1446).

I ran all five on 4.5.1, 4.6.2 and 4.7.2, and each reproduces what the session recorded. The three that drive the server find the binary the way the tests do, or take --didi.

Two things came up while making them reusable. Godot's JSON.stringify writes control characters raw and \' as an escape, so names travel as UTF-8 byte arrays. And a Windows pipe uses the console code page, so the two probes that print non-ASCII names set stdout to UTF-8.

One engine line is in the session log rather than a probe. A first --import of the connection probe's project printed ERROR: Parameter "singleton" is null. once on 4.7.2. Four reruns and a bisect of the project did not bring it back.

Tooling only, so no changelog line, as with #1232. The docs validator, the native suite, the Python suite and the test counts pass locally.