Add verified Dev Brain skills

README.md

@@ -16,6 +16,10 @@ the Metal kernels and small native integration layers are adapted from
   project files; run and monitor asynchronous shell commands; search Google;
   and visit rendered web pages. File access is confined to the project, output
   is bounded, and risky shell or visible-browser actions require approval.
+- **Project-backed Dev Brain.** An optional managed Obsidian vault provides
+  source-verified wiki pages, ranked search, and on-demand skills. Each session
+  receives the verified skill names, descriptions, and paths, then loads full
+  instructions only when a task matches.
 - **Long-running sessions.** Transcripts and summaries are stored in SQLite.
   Automatic and manual context compaction preserve the complete visible chat,
   while durable KV checkpoints make follow-up turns and relaunches resumable.