docs: add llms.txt, AGENTS.md and CLAUDE.md

[lpsm-dev]

Adiciona os três arquivos de contexto para agentes/LLMs solicitados.

Arquivos

• AGENTS.md - guia voltado a máquinas (contraparte do CONTRIBUTING.md): layout do projeto, comandos reais de build/test/lint (extraídos do Taskfile), e as regras rígidas: CC ≤ 10 (gocyclo), âncoras github-slugger, cuidado com module path de major bumps v2+ (charm.land/*/v2), Conventional Commits e definition of done.
• CLAUDE.md - importa o AGENTS.md via @AGENTS.md (sintaxe de import do Claude Code) e adiciona notas específicas do Claude, evitando duplicação.
• llms.txt - no formato do llmstxt.org: resumo do projeto, referência dos subcomandos com flags, e links para docs e código-fonte (apontando o internal/generator/generator.go como ponto de partida).

Observação sobre os outros dois pedidos

Os outros dois itens que você mencionou já existem no CLI:

1. Enumerar # ## ### + back-to-top ao fim de cada #: coberto por gtoc generate (enumera os headings num TOC com âncoras acentuadas) + gtoc analyze (insere o "back to top" ao fim de cada seção #).
2. Auto-update a partir das releases do GitHub: é o gtoc upgrade (reescrito nesta série de PRs: comparação semver numérica, seleção do asset pela API do GitHub, verificação de checksum SHA-256 e extração pure-Go).

Sem código Go alterado - só documentação.

Co-Authored-By: Claude noreply@anthropic.com

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⚙️ Run configuration

Configuration used: defaults

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Run ID: 37e97bb1-be70-48a4-80b8-edfb5b5cfdd3

📥 Commits

Reviewing files that changed from the base of the PR and between aca4373 and 9f2596f.

📒 Files selected for processing (3)

• AGENTS.md
• CLAUDE.md
• llms.txt

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/agent-docs

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