chore: scaffold Kolmekivi from nih-plug-template

A stereo delay/echo plugin. Scaffolded rather than forked: the template
and the plugins built from it diverge on branding immediately, so they
share code by file copy — as codename-206 does — not by merge base. This
repo starts its own history.

Branded with tools/brand-plugin.sh. Everything derives from PLUGIN_NAME
("Kolmekivi" -> kolmekivi / Kolmekivi / KolmekiviParams), so no override
is pinned. CODENAME is set to the repo name and, by convention, stays
there even if the plugin is later renamed.

Two identity constants are now frozen and must never move, because hosts
key saved projects and presets off them:

    CLAP_ID        org.novoyuuparosk.kolmekivi
    VST3_CLASS_ID  KolmekiviDelay!!            (exactly 16 bytes)

Host categorisation is set for a delay rather than left at the template's
generic placeholders — ClapFeature::{AudioEffect,Delay,Stereo} and
Vst3SubCategory::{Fx,Delay}. These decide where the plugin appears in a
host's browser and are not covered by the branding checker, which knows
about names rather than categories.

The DSP is not written. src/lib.rs still carries the template's example
gain parameter, so the plugin builds, bundles and loads while the delay is
implemented.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WHt4DykxXaQnyaJfyS8KCn

tools/branding-sites.tsv

@@ -0,0 +1,45 @@
+# branding-sites.tsv - every place a canonical name has to appear, and in what form.
+#
+# Generated and refreshed by tools/brand-plugin.sh; read by tools/check-branding.sh,
+# which asserts each pattern is present in its file. Tab-separated, four columns:
+#
+#   kind    req = a missing file is a failure; opt = a missing file is a skip
+#   owner   the brand-plugin.sh rule that manages this row, or "custom" for rows
+#           you added by hand. Custom rows are preserved across regeneration;
+#           owned rows are overwritten, so do not hand-edit those.
+#   file    repo-relative path
+#   pattern literal text that must appear in that file, already resolved
+#
+# Adding a site for something the template does not ship is a one-line edit here
+# with owner "custom" - no shell to change, and it survives the next rename.
+#
+#kind	owner	file	pattern
+req	pkg.cargo	Cargo.toml	name = "kolmekivi"
+req	pkg.bundler	bundler.toml	[kolmekivi]
+opt	pkg.lock	Cargo.lock	name = "kolmekivi"
+opt	pkg.ci	.github/workflows/ci.yaml	cargo xtask bundle kolmekivi
+opt	pkg.readme	README.md	cargo xtask bundle kolmekivi
+req	display.bundler	bundler.toml	name = "Kolmekivi"
+opt	display.notice	NOTICE	Kolmekivi
+req	name.plugin	src/lib.rs	const NAME: &'static str = "Kolmekivi"
+req	vendor.plugin	src/lib.rs	const VENDOR: &'static str = "Novoyuuparosk"
+req	email.plugin	src/lib.rs	const EMAIL: &'static str = "mikkeli@novoyuuparosk.org"
+req	authors.cargo	Cargo.toml	authors = ["Mikkeli Matlock <mikkeli@novoyuuparosk.org>"]
+req	homepage.cargo	Cargo.toml	homepage = "http://192.168.2.199:3005/musiikki/kolmekivi"
+req	url.plugin	src/lib.rs	const URL: &'static str = env!("CARGO_PKG_HOMEPAGE")
+req	description.cargo	Cargo.toml	description = "A stereo delay/echo plugin built with NIH-plug"
+req	description.clap	src/lib.rs	Some("Stereo delay with feedback and mix control")
+req	clapid.plugin	src/lib.rs	const CLAP_ID: &'static str = "org.novoyuuparosk.kolmekivi"
+req	vst3id.plugin	src/lib.rs	const VST3_CLASS_ID: [u8; 16] = *b"KolmekiviDelay!!"
+req	struct.def	src/lib.rs	struct Kolmekivi {
+req	struct.plugin	src/lib.rs	impl Plugin for Kolmekivi {
+req	struct.clap	src/lib.rs	impl ClapPlugin for Kolmekivi {
+req	struct.vst3	src/lib.rs	impl Vst3Plugin for Kolmekivi {
+req	struct.exportclap	src/lib.rs	nih_export_clap!(Kolmekivi);
+req	struct.exportvst3	src/lib.rs	nih_export_vst3!(Kolmekivi);
+req	params.def	src/lib.rs	struct KolmekiviParams {
+req	params.default	src/lib.rs	impl Default for KolmekiviParams {
+req	params.field	src/lib.rs	params: Arc<KolmekiviParams>,
+opt	deploy.pkg	deploy.ps1	$Package = "kolmekivi"
+opt	deploy.vst3	deploy.ps1	$vst3Name = "Kolmekivi.vst3"
+opt	deploy.clap	deploy.ps1	$clapName = "Kolmekivi.clap"