qa: package + document controls (0.1.0 release check PASS)

- Docs/controls.md: full binding table + headless input-test note.
- AGigLineHUD: draw a control legend bottom-right every frame
  (WASD move / Mouse look / Space jump / R reset / Esc pause).
- Verified on the packaged Development build: launches straight into DemoMap, no
  missing-asset or linker errors; controls text confirmed in the capture
  (bottom-right bbox 426x12 px). Evidence in Docs/release-checks.md +
  Docs/perf/0.1.0-packaged-hud-controls.png.

Docs/controls.md

@@ -0,0 +1,36 @@
+# Controls (`0.1.0` walkable demo)
+
+Keyboard and mouse. The same list is shown in-game, bottom-right of the frame
+(`AGigLineHUD`), and the packaged Linux build ships with these bindings.
+
+| Action | Key | Notes |
+| --- | --- | --- |
+| Move forward | `W` | 4 m/s walk |
+| Move back | `S` | |
+| Strafe right | `D` | |
+| Strafe left | `A` | |
+| Look | Mouse | Captured on launch; `Escape` releases it |
+| Jump | `Space` | |
+| Reset to start | `R` | Returns to the grounded spawn point |
+| Pause / release mouse | `Escape` | Second press resumes and recaptures the mouse |
+
+## Notes
+
+- Movement is relative to where you are looking (controller yaw), so the capsule
+  stays upright on the sloped street.
+- The mouse is captured on launch, so looking works without clicking first.
+  `Escape` toggles the capture as part of pause.
+- Bindings are Enhanced Input actions in `/Game/Input` built by
+  `Tools/ue_create_input_assets.py`; the mapping context is `IMC_Default`.
+
+## Testing input without a physical keyboard
+
+`Tools/input_test.py` injects OS-level keyboard/mouse events through a virtual
+`/dev/uinput` device (see `Tools/input_emulation.py`), e.g.:
+
+```bash
+python3 Tools/input_test.py --sequence move:2,look:3
+```
+
+It drives the focused game window exactly like real hardware, which is how the
+controls were regression-tested on the packaged build.