chore(marketplace): add ourdigital-skills local marketplace + fix README install docs (#1)

README.md

@@ -12,6 +12,11 @@ cd our-claude-skills/custom-skills/_ourdigital-shared
 ./install.sh
 ```
 
+This symlinks the global slash commands into `~/.claude/commands/`, sets up the
+Python virtual environment, and configures credentials. It does **not** register
+skills natively — to load a skill as a Claude Code skill, also symlink it into
+`~/.claude/skills/` (see [Usage → Claude Code](#claude-code)).
+
 ## Custom Skills Overview
 
 ### OurDigital Core (01-10)
@@ -215,16 +220,23 @@ The `_ourdigital-shared/` directory provides:
 
 ### Claude Code
 
-Skills are auto-detected via symlinks in `~/.claude/skills/`:
+The Quick Install symlinks the **slash commands** into `~/.claude/commands/`. To
+also load a skill natively, symlink its **root** directory (which holds the
+loadable `SKILL.md`) into `~/.claude/skills/`, using the clean name without the
+`NN-` prefix:
 
 ```bash
-# Install skill symlink
-ln -sf /path/to/skill/desktop ~/.claude/skills/skill-name
+# From the repo root — symlink a skill into Claude Code
+ln -sf "$PWD/custom-skills/16-seo-schema-validator" ~/.claude/skills/seo-schema-validator
 ```
 
+> Legacy skills that don't yet have a root `SKILL.md` expose it under
+> `code/SKILL.md` instead — symlink `.../<skill>/code` for those.
+
 ### Claude Desktop
 
-Copy the `desktop/SKILL.md` file to your Claude Desktop skills folder.
+Import the skill's `desktop/` folder (containing `SKILL.md` + `skill.yaml`) via
+your Claude Desktop skills settings.
 
 ## Development