docs(discussions): add Round 13 engine selection discussion

Full team debate on engine paradigms, leading to Godot client + Rust simulation via subprocess/IPC (D-020). Includes Tyre/Troblum sidequest, IP pivot to original setting, and serialization format selection. Updated discussions index. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-09 23:06:21 +01:00
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commit 615a32f431
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@@ -16,3 +16,4 @@ Historical discussion rounds from the Commonwealth game design process.
 | 10 | Map, Fog & Borderless | D-011, D-012, D-013, D-014 | [round-10](round-10-map-fog-borderless.md) |
 | 11 | Insert, Sound & Camera | D-015, D-016, D-017, D-018 | [round-11](round-11-insert-sound-camera.md) |
 | 12 | Top-Down Final | D-019 | [round-12](round-12-top-down-final.md) |
+| 13 | Engine Selection | D-020, R-004–R-010 | Active in DISCUSSION.md |