point the editor preview at the demo, and shorten the skill name

Four small things from one sitting, none of which would be reverted without the
others:

- .claude/launch.json describes the only dev server this repo has: make demo on
  localhost:8080. Deliberately not autoPort — examples/demo-site declares
  base: http://localhost:8080, so canonical, hreflang, OpenGraph and sitemap URLs
  are built from that port, and a reassigned one would make the absolute URLs on
  the page wrong while still rendering fine.
- The skill is .claude/skills/feature-loop/, without the khosra- prefix. ADR-0054
  records it, because ADR-0030 had named the prefixed form while settling the
  project name and decisions.md is append-only.
- Makefile .PHONY was missing quiet and surface, added two commits ago. A file of
  either name in the repo root would have silently shadowed the target.
- A latent row: the root listing's title reads "A Khosra Demo · A Khosra Demo",
  because base.html joins page title and site title unconditionally and at the
  root they are the same string. Found by looking at the served page — no test
  asserts a title. Theme layer, one if, and it waits for Phase G4.

.claude/launch.json

@@ -0,0 +1,11 @@
+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "demo",
+      "runtimeExecutable": "make",
+      "runtimeArgs": ["demo"],
+      "port": 8080
+    }
+  ]
+}