Add AGENTS.md and CLAUDE.md to root repository (#16604)

AGENTS.md

@@ -0,0 +1,21 @@
+# AGENTS.md
+
+## Building
+
+For a full build from the repository root:
+
+```sh
+cmake -B build .
+cmake --build build --parallel 8
+./ollama serve
+```
+
+For quick Go-only iteration against an existing native payload:
+
+```sh
+go build .
+go run . serve
+```
+
+See `docs/development.md` for prerequisites, platform notes, GPU backends, and
+the full development workflow.

CLAUDE.md

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+# CLAUDE.md
+
+See `AGENTS.md` for the shared agent instructions for this repository.