docs: correct version number to 1.3.0 in architecture and physics docs

Signed-off-by: arounamounchili <patouossa.mounchili@gmail.com>

Author: arounamounchili

ARCHITECTURE.md

@@ -84,4 +84,4 @@ sequenceDiagram
 ---
 
 **Last Updated:** 2026-04-15
-**Version:** 1.6.0
+**Version:** 1.3.0

docs/source/how_to/physics.md

@@ -76,7 +76,7 @@ assembly.add_link("chassis") \
 ```
 
 ::: {important}
-**Hardened Physics (v1.6.0)**: In this version, LinkForge has been upgraded with
+**Hardened Physics (v1.3.0)**: In this version, LinkForge has been upgraded with
 production-grade numerical hardening. The mesh inertia pipeline now uses the
 **Mirtich algorithm** (Divergence Theorem) combined with:
 - **Numerical Conditioning**: Automatically translates meshes to a local origin