docs: add Nika to projects

docs/projects/Nika.md

@@ -0,0 +1,10 @@
+
+# Nika
+
+[Nika](https://github.com/supernovae-st/nika) is an open-source (AGPL, Rust) workflow engine for AI: repeatable work lives in plain `.nika.yaml` DAG files, statically checked before execution (schema, permits, cost floor) with tamper-evident traces after.
+
+Nika's provider layer speaks the OpenAI chat dialect, so a LiteLLM proxy slots in as the gateway: point Nika's `openai` provider at the proxy's base URL and every `infer` task in a workflow routes through LiteLLM — one gateway for keys, budgets and provider fallbacks, while Nika keeps the workflow-side guarantees (static checks before the run, hash-chained trace after).
+
+- [Github](https://github.com/supernovae-st/nika)
+- [Docs](https://docs.nika.sh)
+- [Provider catalog (the `openai` + `base_url` mechanism)](https://docs.nika.sh/reference/providers-catalog)

sidebars.js

@@ -1272,6 +1272,7 @@ const sidebars = {
             "projects/Agent Lightning",
             "projects/Harbor",
             "projects/GraphRAG",
+            "projects/Nika",
             "projects/Docq.AI",
             "projects/PDL",
             "projects/OpenInterpreter",