chore: rename fai-studio-plugin-sdk → fai-plugin-sdk

Adopts the three SDK families convention documented in
fai/platform/docs/architecture/sdks.md: each base SDK
(module, plugin, client) gets a language suffix on dir + repo
so polyglot variants can be added later without renaming.

  fai_studio_plugin_sdk  → fai_plugin_sdk_rust
  fai-studio-plugin-sdk  → fai-plugin-sdk
  fai/studio-plugin-sdk  → fai/plugin-sdk-rust

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

README.md

@@ -1,6 +1,16 @@
-# fai-studio-plugin-sdk
+# fai-plugin-sdk (Rust)
 
-Rust SDK for writing F∆I Studio plugins.
+Rust SDK for writing F∆I plugins (Studio extensions). One of
+three SDK families documented in
+`fai/platform/docs/architecture/sdks.md`:
+
+  * `fai-module-sdk` (Rust)  — building flow modules
+  * `fai-plugin-sdk` (Rust)  — building plugins  ← this crate
+  * `fai-client-sdk` (Dart)  — building hub-talking clients
+
+Each gets a language-suffix on its dir/repo so polyglot
+variants can be added later without renaming the existing
+ones (e.g. a future `fai-plugin-sdk-go`).
 
 ## Status
 
@@ -8,14 +18,14 @@ Rust SDK for writing F∆I Studio plugins.
 world declared in `wit/studio-plugin.wit` can be compiled to
 `wasm32-wasip2` against this crate today. The proof-of-
 contract plugin is `studio-theme-solarized` in the
-fai-modules namespace.
+fai-plugins namespace.
 
 What's NOT yet implemented:
 
 - **Hub side**: a Component-Model loader path for
   `studio-plugin`-world components + the `InvokePlugin`
   gRPC RPC that Studio talks to. Tracked in
-  `fai/platform/docs/advanced/studio-plugin-sdk.md`.
+  `fai/platform/docs/advanced/plugin-sdk.md`.
 - **Studio side**: `plugin_host.dart` that discovers
   installed `studio.*` capabilities and dispatches.
 - **Per-hook worlds**: today's v0.1 ships a single world
@@ -43,12 +53,12 @@ edition = "2021"   # match SDK edition
 crate-type = ["cdylib"]
 
 [dependencies]
-fai-studio-plugin-sdk = { git = "https://git.flemming.ai/fai/studio-plugin-sdk", branch = "main" }
+fai-plugin-sdk = { git = "https://git.flemming.ai/fai/plugin-sdk-rust", branch = "main" }
 ```
 
 ```rust
 // src/lib.rs of your plugin
-use fai_studio_plugin_sdk::{bindings, export_plugin};
+use fai_plugin_sdk::{bindings, export_plugin};
 
 type ColorScheme = bindings::fai::studio_plugin::plugin_types::ColorScheme;
 type PluginError = bindings::fai::studio_plugin::plugin_types::PluginError;