rebrand: buuh — a friendly public fork under the uhhm org

Packages renamed to the @uhhm scope (@uhhm/buuh, @uhhm/buuh-html,
@uhhm/buuh-component, @uhhm/buuh-devtools, @uhhm/buuh-migrate,
@uhhm/bankai). Scoping is load-bearing twice over: npm routes registries
per scope so @uhhm/* resolves against project.uhhm.no while everything
else stays on npmjs, and it means this fork never squats upstream's
names anywhere. The codemod now migrates choo v7 apps to the @uhhm
names. README rewritten with the fork framing and full upstream credit;
the choojs RFC moves to docs/upstream-rfc-draft.md, in the drawer for if
this work ever goes home. API unchanged — choo() is still choo().

Also: Gitea Actions CI + release workflows (npm publish to the uhhm
registry on tag push, CDN bundle uploaded as a generic package),
npm run bundle producing dist-cdn/buuh.js (the whole framework as one
minified ES module for import-map use), docs/publishing.md explaining
what Gitea Packages is (a real npm registry) and is not (a CDN — serve
the bundle from a static host with module-safe MIME instead), and
onload.js constructing window.MutationObserver to match its own guard
(surfaced by smoke-testing the bundle outside a full browser).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014NgfSjHE11oFpoSnLVKLXd

test/e2e/serve.js

@@ -24,12 +24,12 @@ const MIME = {
 
 const IMPORT_MAP = JSON.stringify({
   imports: {
-    '@choojs/core': '/packages/core/index.js',
-    '@choojs/core/timing': '/packages/core/lib/timing.js',
-    '@choojs/html': '/packages/html/browser.js',
-    '@choojs/html/raw': '/packages/html/raw.js',
-    '@choojs/html/morph': '/packages/html/morph.js',
-    '@choojs/html/hydrate': '/packages/html/hydrate.js'
+    '@uhhm/buuh': '/packages/core/index.js',
+    '@uhhm/buuh/timing': '/packages/core/lib/timing.js',
+    '@uhhm/buuh-html': '/packages/html/browser.js',
+    '@uhhm/buuh-html/raw': '/packages/html/raw.js',
+    '@uhhm/buuh-html/morph': '/packages/html/morph.js',
+    '@uhhm/buuh-html/hydrate': '/packages/html/hydrate.js'
   }
 })