Add new tech article: brewing up the stack (LLM proxies, Caddy migration, Grok-bot)

- New post: brewing up the stack covering GopherGate LLM proxy, Grok-bot, Dissertation Path updates, pi.dev migration, Caddy reverse-proxy switch, and Gemma4 experiments
- Add author tone & voice profile for consistent writing reference
- Add .gitignore for Pi-lens cache and build artifacts

.gitignore

@@ -0,0 +1,28 @@
+# Pi-lens cache and state
+.pi-lens/
+
+# Jekyll build output
+_site/
+.sass-cache/
+.jekyll-cache/
+.jekyll-metadata
+
+# Environment files
+.env
+.env.local
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~