feat: initial scaffold with context adapters and litellm pkg

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

README.md

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+# __PROJECT_NAME__
+
+Go agent built on [Google ADK](https://google.golang.org/adk) with a LiteLLM adapter for local model routing.
+
+## Quick start
+
+```bash
+cp .env.example .env
+# edit .env with your LITELLM_API_KEY
+go mod tidy
+task run
+```
+
+## Observability
+
+Set `OTLP_ENDPOINT=http://jaeger.d-ma.be:4318` to emit traces. Each invocation produces:
+- `invoke_agent __PROJECT_NAME__` span
+- `generate_content <model>` child span with `gen_ai.request.model` attribute
+
+## Structure
+
+```
+cmd/__PROJECT_NAME__/   agent entrypoint
+pkg/litellm/           OpenAI-compat ADK adapter + OTLP telemetry helper
+```