feat: v0.1.0 — Studio Plugin SDK

First release of the SDK that Studio plugins depend on.

What v0.1 ships:

- WIT contract under wit/ (studio-plugin.wit +
  deps/platform/world.wit, both verbatim from
  fai/platform/wit/).
- wit-bindgen 0.36 generate! call with pub_export_macro
  enabled so the emitted __export_studio_plugin_impl! macro
  is reachable from downstream plugin crates.
- export_plugin!(MyType) convenience macro that wraps the
  bindgen-generated impl macro.
- README documenting usage + v0.1 limits (single-world ->
  all-three-hooks-required, no proc-macro yet, edition
  2021 pinned by wit-bindgen output).

What v0.1 doesn't yet do:

- Plugins still declare all three Guest impls (theme,
  translate, output-view). v0.2 splits the WIT into one
  world per hook.
- No #[plugin(...)] proc-macro. v0.2 wraps generate! +
  Guest impl generation into a single attribute.
- Host-side: the hub doesn't yet load studio-plugin-world
  components or expose InvokePlugin RPC — that's the next
  push.

Validated against the in-tree studio-theme-solarized
plugin: 22 KiB stripped .wasm artefact, valid Component
Model, passes wasm-tools component wit inspection.

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

.gitignore

@@ -0,0 +1,4 @@
+target/
+**/*.rs.bk
+.DS_Store
+Cargo.lock