docs: add public frontmatter to docs for soulcraft.com/docs pipeline

Add YAML frontmatter (slug, public, category, template, order) to 8
existing docs and 2 new getting-started guides (installation, quick-start).
Include docs/**/*.md in npm package files so the portal sync-docs script
can read them from node_modules after publish.

Update CLAUDE.md with docs pipeline trigger phrases and release checklist.

package.json

@@ -151,6 +151,7 @@
     "assets/models/all-MiniLM-L6-v2/**",
     "bin/",
     "brainy.png",
+    "docs/**/*.md",
     "LICENSE",
     "README.md",
     "CHANGELOG.md"