Vendor iris, the in-house UI library, at iris/

Iris's decision: it lives in this repository for now, included by path,
with its history left in the iris/iris repository on the gitea remote
(this is its main at 7b54aaf, byte-identical to the public GitHub copy).
It gets its own repository back once it has proved itself here.

RUST.md's I0 records the decision and what the first build said: the
tree does not compile on the current nightly because const_trait_impl
now requires traits to be declared 'const trait', which is the first
item of I0b.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

iris/Cargo.toml

@@ -0,0 +1,42 @@
+[package]
+name = "iris"
+version.workspace = true
+edition.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+iris-core = { workspace = true }
+iris-macro = { workspace = true }
+cosmic-text = { workspace = true }
+unicode-segmentation = { workspace = true }
+winit = { workspace = true }
+arboard = { workspace = true, features = ["wayland-data-control"] }
+pollster = { workspace = true }
+wgpu = { workspace = true }
+image = { workspace = true }
+tokio = { workspace = true, features = ["sync", "rt", "rt-multi-thread"] }
+
+[dev-dependencies]
+tokio = { workspace = true, features = ["sync", "rt", "rt-multi-thread", "time"] }
+
+[workspace]
+members = ["core", "macro"]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2024"
+
+[workspace.dependencies]
+pollster = "0.4.0"
+winit = "0.30.12"
+wgpu = "28.0.0"
+bytemuck = "1.23.1"
+image = "0.25.6"
+cosmic-text = "0.16.0"
+unicode-segmentation = "1.12.0"
+fxhash = "0.2.1"
+arboard = "3.6.1"
+iris-core = { path = "core" }
+iris-macro = { path = "macro" }
+tokio = "1.49.0"