docs: add README with provider setup and dev/test instructions

README.md

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+# gnoma
+
+Provider-agnostic agentic coding assistant in Go.
+Named after the northern pygmy-owl (*Glaucidium gnoma*). Agents are called **elfs** (elf owl).
+
+## Build
+
+```sh
+make build          # ./bin/gnoma
+make install        # $GOPATH/bin/gnoma
+```
+
+## Providers
+
+### Anthropic
+
+```sh
+export ANTHROPIC_API_KEY=sk-ant-...
+./bin/gnoma --provider anthropic
+./bin/gnoma --provider anthropic --model claude-opus-4-5-20251001
+```
+
+Integration tests hit the real API — keep a key in env:
+
+```sh
+go test -tags integration ./internal/provider/...
+```
+
+---
+
+### OpenAI
+
+```sh
+export OPENAI_API_KEY=sk-proj-...
+./bin/gnoma --provider openai
+./bin/gnoma --provider openai --model gpt-4o
+```
+
+---
+
+### Mistral
+
+```sh
+export MISTRAL_API_KEY=...
+./bin/gnoma --provider mistral
+```
+
+---
+
+### Google (Gemini)
+
+```sh
+export GEMINI_API_KEY=AIza...
+./bin/gnoma --provider google
+./bin/gnoma --provider google --model gemini-2.0-flash
+```
+
+---
+
+### Ollama (local)
+
+Start Ollama and pull a model, then:
+
+```sh
+./bin/gnoma --provider ollama --model gemma4:latest
+./bin/gnoma --provider ollama --model qwen3:8b     # default if --model omitted
+```
+
+Default endpoint: `http://localhost:11434/v1`. Override via config or env:
+
+```sh
+# .gnoma/config.toml
+[provider]
+default = "ollama"
+model   = "gemma4:latest"
+
+[provider.endpoints]
+ollama = "http://myhost:11434/v1"
+```
+
+---
+
+### llama.cpp (local)
+
+Start the llama.cpp server:
+
+```sh
+llama-server --model /path/to/model.gguf --port 8080 --ctx-size 8192
+```
+
+Then:
+
+```sh
+./bin/gnoma --provider llamacpp
+# model name is taken from the server's /v1/models response
+```
+
+Default endpoint: `http://localhost:8080/v1`. Override:
+
+```sh
+[provider.endpoints]
+llamacpp = "http://localhost:9090/v1"
+```
+
+---
+
+## Config
+
+Config is read in priority order:
+
+1. `~/.config/gnoma/config.toml` — global
+2. `.gnoma/config.toml` — project-local (next to `go.mod` / `.git`)
+3. Environment variables
+
+Example `.gnoma/config.toml`:
+
+```toml
+[provider]
+default = "anthropic"
+model   = "claude-sonnet-4-6"
+
+[provider.api_keys]
+anthropic = "${ANTHROPIC_API_KEY}"
+
+[provider.endpoints]
+ollama   = "http://localhost:11434/v1"
+llamacpp = "http://localhost:8080/v1"
+
+[permission]
+mode = "auto"   # auto | accept_edits | bypass | deny | plan
+```
+
+Environment variable overrides: `GNOMA_PROVIDER`, `GNOMA_MODEL`.
+
+---
+
+## Testing
+
+```sh
+make test               # unit tests
+make test-integration   # integration tests (require real API keys)
+make cover              # coverage report → coverage.html
+make lint               # golangci-lint
+make check              # fmt + vet + lint + test
+```
+
+Integration tests are gated behind `//go:build integration` and skipped by default.