feat: initial scaffold with context adapters and litellm pkg

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.context/PROJECT.md

@@ -0,0 +1,22 @@
+# __PROJECT_NAME__
+
+## Identity
+
+- **Name**: __PROJECT_NAME__
+- **Owner**: Mathias
+- **Client**: personal
+- **Repo**: gitea.d-ma.be/mathias/__PROJECT_NAME__
+- **Status**: active
+
+## Stack
+
+Go + ADK + LiteLLM. See `~/dev/.context/AGENT.md` for cross-project conventions.
+
+## Agent
+
+TODO: describe what this agent does, what tools it has, and what it's responsible for.
+
+## Observability
+
+Traces → Jaeger via `OTLP_ENDPOINT`. Set `ADK_SERVICE_NAME=__PROJECT_NAME__` per deployment.
+Spans emitted: `invoke_agent`, `generate_content`. Tool spans require custom callbacks.