feat: studio-theme-solarized v0.1.0 — skeleton

First Studio plugin in the new `studio.*` capability namespace.
SKELETON — does not yet compile.

Why ship the skeleton now:

  * Pins Ethan Schoonover's Solarized palette as two const
    Material 3 ColorScheme arrays so the in-tree reference
    doesn't bike-shed at SDK-integration time.
  * Gives the future fai-studio-plugin-sdk author a concrete
    consumer to validate the generated `#[plugin(theme)]`
    macro output against.
  * Validates that the WIT in fai/platform parses by being a
    real crate that references it.

What it does NOT yet do:

  * Compile. The `fai-studio-plugin-sdk` dependency it points
    at doesn't exist. Tracked in
    `fai/platform/docs/advanced/studio-plugin-sdk.md`.
  * Plug into Studio. The plugin-host module that would
    discover and invoke this component lives in the same
    deferred-Phase-1 work.

What it ships:

  * module.yaml declaring `provides: studio.theme.solarized`
    and `studio_extension.hooks: [theme]`.
  * Cargo.toml with the future SDK dependency commented out,
    crate-type=cdylib, component metadata.
  * src/lib.rs with both Solarized colour palettes
    (SOLARIZED_LIGHT and SOLARIZED_DARK), 14 ARGB tokens
    each in Material 3 order, plus the future `#[plugin]`
    function body commented out and two sanity tests on the
    palette constants.
  * README.md explaining the status and the steps to finish
    the plugin once the SDK ships.

Signed-off-by: flemming-it <sf@flemming.it>

Cargo.toml

@@ -0,0 +1,48 @@
+# SKELETON — does not yet compile.
+#
+# This crate targets the studio-plugin world declared in
+# `wit/studio-plugin.wit`. It cannot be built until two
+# upstream pieces ship:
+#
+#   1. The `fai-studio-plugin-sdk` crate that wraps the WIT
+#      bindings with an ergonomic Rust API (the `#[plugin(theme)]`
+#      attribute referenced in `src/lib.rs`).
+#   2. Studio's plugin-host module that discovers, loads, and
+#      invokes plugin components at GUI startup.
+#
+# Both are documented in `docs/advanced/studio-plugin-sdk.md`.
+# Until they exist, this directory serves three purposes:
+#
+#   - Validates the WIT-file structure by being a real crate that
+#     references it (parse-only path).
+#   - Locks in the exact Solarized colour palette so the
+#     in-tree first plugin doesn't bike-shed at integration time.
+#   - Gives the SDK author a concrete consumer to test against.
+
+[package]
+name = "studio_theme_solarized"
+version = "0.1.0"
+edition = "2024"
+authors = ["Dr. Stefan Flemming <platform@flemming.ai>"]
+license = "Apache-2.0"
+publish = false
+description = "F∆I Studio plugin — Solarized Light and Dark theme"
+repository = "https://git.flemming.ai/fai-modules/studio-theme-solarized"
+rust-version = "1.85"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+# Forward-reference: this crate doesn't yet exist. Tracked in
+# docs/advanced/studio-plugin-sdk.md.
+# fai-studio-plugin-sdk = { git = "https://git.flemming.ai/fai/studio-plugin-sdk", branch = "main" }
+
+[package.metadata.component]
+package = "fai:studio-plugin"
+
+[profile.release]
+opt-level = "s"
+lto = true
+codegen-units = 1
+strip = true