docs: update README to reflect completed DSP and fix stale references

- Replace 'DSP not written yet' description with actual stereo delay
  DSP summary.
- Update src/lib.rs description in project structure tree.
- Replace stale 192.168.2.199 IP with pi5-16.local hostname in the
  clone URL (both in README body and Quick Start example).

README.md

@@ -2,13 +2,13 @@
 
 A stereo delay/echo plugin — Rust, CLAP/VST3, egui.
 
-Scaffolded from [`musiikki/nih-plug-template`](http://192.168.2.199:3005/musiikki/nih-plug-template);
-the DSP is not written yet, the plugin currently passes audio through an example gain stage.
+Scaffolded from [`musiikki/nih-plug-template`](http://pi5-16.local:3005/musiikki/nih-plug-template);
+the DSP is a simple stereo delay with independent left/right delay lines, feedback, and a wet/dry mix control.
 
 ## Quick Start
 
 ```bash
-git clone http://192.168.2.199:3005/musiikki/kolmekivi
+git clone http://pi5-16.local:3005/musiikki/kolmekivi
 cd kolmekivi
 cargo xtask bundle kolmekivi --release --features vst3
 ```
@@ -81,7 +81,7 @@ cp -r "target/bundled/Kolmekivi.vst3" ~/.vst3/
 ```
 Cargo.toml          # Package deps + the opt-in `vst3` feature — NIH-plug pinned to codename-206's rev
 bundler.toml        # Bundle name for `cargo xtask bundle`
-src/lib.rs          # Plugin skeleton — params, DSP, and egui editor, with one example gain param
+src/lib.rs          # Plugin — params, stereo delay DSP, and egui editor
 xtask/              # Bundler xtask (cargo xtask bundle)
 .cargo/config.toml  # xtask alias
 tools/              # Branding toolkit — see Renaming