README: simplify wording — 10 physics tasks (compose composition)

README.md

@@ -12,7 +12,7 @@ Full release of the **Apple-Pi physics benchmark**: **400 cases (243 simulation
 apple-pi-full/
 ├── README.md
 ├── croissant.json
-├── sim_subset/         # 243 simulation cases (9 single-task families + composition)
+├── sim_subset/         # 243 simulation cases (10 physics tasks)
 └── realworld_subset/   # 157 realworld cases (7 physics categories)
 ```
 
@@ -33,7 +33,7 @@ apple-pi-full/
 
 ## Tasks
 
-**Simulation (9 single-task families + composition)**: at_rest, circular, freefall, inclined_plane, inelastic_collision, perfectly_elastic_collision, perfectly_inelastic_collision, projectile, uniform_linear, composition.
+**Simulation (10 physics tasks)**: at_rest, circular, freefall, inclined_plane, inelastic_collision, perfectly_elastic_collision, perfectly_inelastic_collision, projectile, uniform_linear, composition.
 
 **Realworld (7 physics categories)**: NewtonsFirstLaw/AtRest, Gravity/{Freefall, Projectile}, ConservationofMomentum/{InelasticCollision, PerfectlyElasticCollision, PerfectlyInelasticCollision}, Composition.