feat: adopt the template's branding toolkit

Replaces the single check-branding.sh with the four-file toolkit from
musiikki/nih-plug-template, moved under tools/ alongside where the deploy
scripts will eventually live.

The two scripts are byte-identical to the template's; everything specific
to this plugin lives in tools/branding.conf and tools/branding-sites.tsv.
That is the point of the split: syncing an improvement is now a file copy
rather than a shell merge, which is what the last two syncs had become.

This repo's data differs from the template's in ways that exercise the
design rather than fight it: params live in src/params.rs rather than
src/lib.rs, deploy.ps1 exists so its three rows check instead of skip, and
the CI bundle command carries no --features flag because VST3 is always on
here. All of that is table data now, not forked shell.

Nothing needed overriding: PKG, STRUCT and PARAMS_STRUCT all derive
correctly from PLUGIN_NAME ("Bari 206" -> bari_206 / Bari206 /
Bari206Params). AUTHOR is pinned because this plugin separates the person
who wrote it from the organisation that vends it — a distinction the
template could not express until integrating here surfaced it.

Adopting it required two upstream fixes, both made in the template first
so the scripts stay identical: cargo AUTHOR as a value distinct from
Plugin::VENDOR, and site patterns narrowed to the smallest distinctive
fragment after this repo's rustfmt-wrapped CLAP_DESCRIPTION proved a
statement-spanning pattern cannot match correctly formatted source.

CI is repointed at tools/check-branding.sh, and its path filter widened to
tools/** — the old filter named a file that no longer exists, so a change
to the toolkit would have triggered no CI at all.

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

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ on:
       - 'Cargo.toml'
       - 'Cargo.lock'
       - 'bundler.toml'
-      - 'check-branding.sh'
+      - 'tools/**'
   pull_request:
     branches: [ master ]
   workflow_dispatch:
@@ -40,7 +40,7 @@ jobs:
       # Cheap and needs no toolchain, so it runs first: a rename that only
       # landed in half the files is worth catching before spending a build on it.
       - name: Branding consistency
-        run: sh check-branding.sh
+        run: sh tools/check-branding.sh
 
       - name: Build
         run: cargo build --release