Update Sphinx docs with v0.15.0 Hardware I/O Simulator, bump version

docs/development.md

@@ -18,10 +18,11 @@
 | 0.12.0 | | BSAVE/BLOAD, TUI ANSI 16-color rendering, CGA graphics framebuffer PEEK/POKE, keyboard shift flags |
 | 0.13.0 | | VIEW/WINDOW/PALETTE graphics, PMAP function, MBF float format for CVS/CVD/MKS$/MKD$ |
 | 0.14.0 | | MBF binary file compatibility (IEEE↔MBF at save/load boundary), fix binary loader null-byte truncation, fix DRAW M/S/A bugs, add TA/=var;/X substring |
+| 0.15.0 | | Hardware I/O simulator: OUT/INP/WAIT/MOTOR statements, port emulation (8253 PIT, PPI speaker, CGA mode/color, COM1, game port), continuous tone via PulseAudio |
 
 ## Tests
 
-68 test programs in `tests/programs/`, plus 4 classic interactive programs in
+70 test programs in `tests/programs/`, plus 4 classic interactive programs in
 `tests/classic/` (Hamurabi, Lunar Lander, Gunner, Diamond from David Ahl's
 *BASIC Computer Games*).
 
@@ -31,10 +32,10 @@ Run the full automated suite:
 bash tests/run_tests.sh
 ```
 
-Each test has a 5-second timeout. 62 tests have `.expected` golden files
-for output regression detection. Three timing-dependent tests (datetime,
-on_timer, timer_stop) and one visual test (color_test) run without golden
-comparison.
+Each test has a 5-second timeout. 65 tests have `.expected` golden files
+for output regression detection. Tests without golden comparison: datetime,
+on_timer, timer_stop (timing-dependent), color_test (visual), play_music
+(audio duration).
 
 ### Compatibility Testing