tools+docs: the flight pad was writing into a dead file - every autopilot input went nowhere

flight_probe.Pad opened /tmp/sylph-vgamepad.fifo, "the vgamepad server's FIFO".
That server was removed when the uinput pad was replaced by Canary's --hid=file
driver, because a uinput device is not namespaced and scripted presses leaked to
the host's desktop. The FIFO is now an ordinary 91-byte file nothing reads, and
/tmp/xenia_pad.txt - the file the emulator polls - was 0 bytes while the
"autopilot" was flying. So every axis, trigger and button from pilot.py,
autopilot3.py, aim_probe.py and flight_probe.py went nowhere, silently.

The corpus already carried this trap for the SHELL scripts
(canary-scripted-input-traps.md, "every call here failed silently"). This class
was missed, and every flight tool imports it.

Verified against the oracle rather than by inspection, on runs confirmed
animating at both ends of every phase: before, full stick produced 0.00 degrees
of heading change over 4 s while the ship travelled 350-735 units, and the
attitude matrix at pos-0x70 was byte-identical; after, LX=-1 turns 12.72 degrees
and LX=+1 swings the flight direction from [1,0,0] to [0.13,-0.14,-0.98], with
the matrix moving 0.44/0.31 under stick and 0.0000 at neutral.

That also REFUTES the "stale attitude matrix" suspicion from the earlier pass -
pos-0x70 is live and tracks the ship; it only looked dead because nothing was
turning the ship.

Still open and said plainly: with the pad fixed a 150 s pilot run still fires 0
times, with |aim yaw| still exactly 90.0 and the target 36-43 km away. Steering
works now, so what is left is the stick SIGN against the pilot's error convention
or a target selection that commits to something too far to close. Both are
finally testable.

findrot_global/findself/findspeed/selfstate still write to the dead FIFO and now
say so in place; they are not repaired because none has been re-run since.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE

tools/re-capture/selfstate.py

@@ -27,6 +27,13 @@ import gmem  # noqa: E402
 import gworld  # noqa: E402
 from findrot_global import scan as scan_rot  # noqa: E402
 
+# 🔴 DEAD FIFO. The vgamepad server this names does not exist any more - the
+# uinput pad was replaced by Canary's `--hid=file` driver - so every write here
+# goes into an ordinary file that nothing reads, silently. See the rewritten
+# `Pad` in flight_probe.py for the format the emulator actually polls, and
+# docs/re/pilot-never-fires.md for what this cost. NOT fixed here: these scripts
+# have not been re-run since, and changing input plumbing under a tool whose
+# results are unverified would only produce new unverified results.
 FIFO = "/tmp/sylph-vgamepad.fifo"