docs: add PT-BR/EN readme with benchmark results

README.md

@@ -1,3 +1,83 @@
+# ctx — anti-tokens CLI para Claude Code
+
+> Analise seu projeto localmente. Envie ao Claude resumos densos, não arquivos brutos.
+
+**Status:** alpha — em desenvolvimento ativo. Interfaces podem mudar.
+
+## Por que usar
+
+Cada token que o Claude lê tem custo e consome janela de contexto. Ao trabalhar em projetos grandes, o Claude frequentemente gasta milhares de tokens apenas lendo arquivos para construir um modelo mental antes de fazer qualquer trabalho real.
+
+`ctx` roda localmente, analisa seu projeto com ferramentas especializadas por linguagem (Roslyn para C#, tree-sitter para TypeScript), e emite resumos compactos em markdown que dão ao Claude tudo que ele precisa em uma fração dos tokens.
+
+### Benchmark
+
+Teste real: análise de "o que preciso mudar para adicionar uma feature" em projeto em produção.
+Ambas as sessões iniciadas com `/clear` — condições equivalentes.
+
+| Teste | Consumo de janela de contexto |
+|-------|-------------------------------|
+| Sem ctx | +7% |
+| Com ctx | +3% |
+
+**Economia: 57%.** Em sessões longas de desenvolvimento, onde o Claude faz a mesma exploração várias vezes ao longo da conversa, essa economia acumula.
+
+## Instalação
+
+```sh
+go install github.com/ricarneiro/ctx/cmd/ctx@latest
+```
+
+Requer Go 1.22+.
+
+## Uso
+
+```sh
+# Contexto git: commits recentes, status, info da branch
+ctx git
+
+# Detectar stack e emitir visão geral do projeto
+ctx auto project
+
+# Estrutura de projeto C# (requer .NET SDK)
+ctx csharp project
+
+# Outline de arquivo C#: tipos, métodos, assinaturas
+ctx csharp outline src/MyService.cs
+
+# Listar erros de compilação
+ctx csharp errors
+```
+
+Toda saída é markdown UTF-8 no stdout. Redirecione onde precisar:
+
+```sh
+ctx csharp project | clip     # Windows
+ctx csharp project | pbcopy   # macOS
+```
+
+Ou referencie em um `CLAUDE.md`:
+
+```markdown
+Run `ctx csharp project` to get the project overview before making changes.
+```
+
+## Contribuindo
+
+Contribuições são bem-vindas. Clone o repositório, faça suas alterações e abra um Pull Request. Para mudanças grandes, abra uma issue primeiro para alinhar o escopo.
+
+```sh
+git clone https://github.com/ricarneiro/CTX.git
+cd CTX
+go build -o ctx.exe ./cmd/ctx
+```
+
+## Licença
+
+MIT — veja [LICENSE](LICENSE).
+
+---
+
 # ctx — anti-tokens CLI for Claude Code
 
 > Analyze your codebase locally. Feed Claude dense summaries, not raw files.
@@ -6,13 +86,21 @@
 
 ## Why
 
-Every token Claude reads costs money and burns context window. When working on
-a large C# or React codebase, Claude often spends thousands of tokens just
-reading files to build a mental model before doing any actual work.
+Every token Claude reads costs money and burns context window. When working on a large codebase, Claude often spends thousands of tokens just reading files to build a mental model before doing any actual work.
 
-`ctx` runs locally, analyzes your project with language-aware tools (Roslyn for
-C#, tree-sitter for TypeScript), and emits compact markdown summaries that give
-Claude everything it needs in a fraction of the tokens.
+`ctx` runs locally, analyzes your project with language-aware tools (Roslyn for C#, tree-sitter for TypeScript), and emits compact markdown summaries that give Claude everything it needs in a fraction of the tokens.
+
+### Benchmark
+
+Real test: analyzing "what needs to change to add a feature" on a production project.
+Both sessions started with `/clear` — equivalent conditions.
+
+| Test | Context window usage |
+|------|----------------------|
+| Without ctx | +7% |
+| With ctx | +3% |
+
+**Savings: 57%.** In long development sessions, where Claude performs the same exploration repeatedly throughout a conversation, the savings compound.
 
 ## Installation
 
@@ -20,8 +108,7 @@ Claude everything it needs in a fraction of the tokens.
 go install github.com/ricarneiro/ctx/cmd/ctx@latest
 ```
 
-Requires Go 1.22+. Binaries for common platforms will be published after the
-MVP is validated.
+Requires Go 1.22+.
 
 ## Usage
 
@@ -55,65 +142,15 @@ Or reference it in a `CLAUDE.md`:
 Run `ctx csharp project` to get the project overview before making changes.
 ```
 
-## Architecture
-
-`ctx` uses a plugin system. Each stack (`git`, `csharp`, `react`, `auto`) is a
-plugin that implements the `core.Plugin` interface and registers itself via
-`init()`.
-
-```
-core.Plugin interface
-  Name() string
-  Version() string
-  ShortDescription() string
-  Command(ctx *core.Context) *cobra.Command
-```
-
-In the MVP, plugins are compiled into the binary. Future plan: migrate to
-subprocess dispatch (binaries named `ctx-csharp`, `ctx-react` in PATH), same
-pattern as `kubectl` plugins.
-
-C# analysis uses a separate helper process (`tools/roslyn-helper/`) written in
-C# with Roslyn. The helper communicates with `ctx` via JSON-RPC over
-stdin/stdout. This lets us use the best tool for the job without pulling a .NET
-runtime into the Go binary.
-
-See `docs/DECISIONS.md` for the full rationale behind each architectural choice.
-
-## Development
-
-### Prerequisites
-- Go 1.26+
-- .NET SDK 10.0+ (for Roslyn helper)
-- golangci-lint (`go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest`)
-
-### Build
-```sh
-go build -o ctx.exe ./cmd/ctx
-```
-
-### Tests & lint
-```sh
-go vet ./...
-golangci-lint run ./...
-```
-
-### Pre-commit hooks
-```sh
-git config core.hooksPath .githooks
-# On Linux/macOS also: chmod +x .githooks/pre-commit
-```
-
-### Roslyn helper
-```sh
-cd tools/roslyn-helper
-dotnet publish src/RoslynHelper -c Release -r win-x64 --self-contained false -o publish/
-```
-
 ## Contributing
 
-Contributions welcome. See `CONTRIBUTING.md` (coming soon) for guidelines.
-Open an issue first if you plan a large change.
+Contributions are welcome. Clone the repository, make your changes, and open a Pull Request. For large changes, open an issue first to align on scope.
+
+```sh
+git clone https://github.com/ricarneiro/CTX.git
+cd CTX
+go build -o ctx.exe ./cmd/ctx
+```
 
 ## License