Initial commit — Stage 0 project foundation

- Cargo workspace with engine, editor, tests crates
- oxide-editor binary stub (builds and runs cleanly)
- install.sh for Linux system installation
- README.md with logo, build and install instructions
- GPLv3 LICENSE
- .gitignore

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -0,0 +1,36 @@
+[workspace]
+resolver = "2"
+members = [
+    "engine",
+    "editor",
+    "tests",
+]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+authors = ["Jaroslav Beneš"]
+license = "GPL-3.0-or-later"
+rust-version = "1.75"
+
+[workspace.dependencies]
+# Math
+glam = "0.28"
+
+# Logging
+log = "0.4"
+env_logger = "0.11"
+
+# Error handling
+anyhow = "1"
+thiserror = "2"
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+ron = "0.8"
+
+[profile.release]
+opt-level = 3
+lto = true
+codegen-units = 1
+strip = true