docs: reorganize usage and migration documentation

[rodri-oliveira-dev]

Summary

This PR reorganizes the public documentation for the maintained 3.x line so each document has a clear responsibility, and adds Codecov integration by reusing the coverage report already produced by the SonarQube Cloud job.

README

• reduces both README files from 529 lines to 177 lines
• reframes project status from hard-coded 3.0 wording to the maintained 3.x line
• keeps the README focused on positioning, key capabilities, installation and quick start
• summarizes current capabilities including two-type multi-mapping, async multiple results, generated materialization, isolated runtimes, DI and Dommel
• removes duplicated provider/AOT/limitation details that belong in compatibility documentation

Usage guides

• adds USAGE.md
• adds USAGE.pt-BR.md
• moves detailed examples for:
  • mapping, conventions and naming policies
  • immutable/nested/value-object materialization
  • profiles
  • FluentMap-controlled queries
  • two-type splitOn multi-mapping
  • sync/async multiple result sets
  • streaming
  • property converters
  • persistence metadata and Dommel
  • generated and strict generated materialization
  • isolated configuration and DI
  • analyzers and trimming/AOT guidance

Migration guides

• reframes migration from 2.x -> 3.0 to 2.x -> 3.x
• adds a minimal migration flow, pre-upgrade checks, scenario decision table and completion checklist
• highlights Dommel/Ignore() migration risks and persistence validation
• makes package identity guidance clearer
• adds MIGRATION.pt-BR.md
• updates the Portuguese README to link to the Portuguese migration guide

Compatibility

• removes the stale hard-coded "stable through 3.0.3" statement
• uses future-proof maintained 3.x wording

Codecov

• adds codecov.yml with project and patch coverage status configuration
• requires 80% patch coverage with a 1% threshold and allows up to a 1% project coverage drop
• enables condensed PR coverage comments and GitHub Checks annotations
• ignores test, benchmark, engineering, build and generated-code paths
• reuses artifacts/coverage/sonar/coverage.xml; tests are not executed a second time
• uploads with Codecov Action v7.1.1 pinned to its commit SHA
• uses GitHub OIDC for authentication instead of a repository upload secret

Documentation responsibilities

• README*: what FluentMap is, why to use it and how to start
• USAGE*: detailed API examples
• MIGRATION*: upgrading from 2.x
• COMPATIBILITY.md: supported versions, providers, AOT/trimming and limitations
• CHANGELOG.md: release-specific changes

Validation

• verified both READMEs contain no stale 3.0 migration/status wording
• verified README language-specific links point to the corresponding usage/migration guides
• checked documented advanced APIs against the current implementation
• removed an invalid QueryMappedSingleOrDefault example discovered during API verification
• confirmed the Codecov upload reuses the existing coverage artifact without adding a second test execution

Summary by CodeRabbit

• Documentação
  • Atualizados os guias de migração da versão 2.x para 3.x, com orientações sobre compatibilidade, configuração, validação e adoção de recursos opcionais.
  • Adicionados guias de uso em português e inglês, cobrindo mapeamentos, consultas, conversores, persistência, integração e limitações de recursos.
  • Reorganizados os READMEs para destacar instalação, início rápido, compatibilidade e links para documentação detalhada.
  • Atualizadas as referências à linha 3.x e à compatibilidade com Semantic Versioning.

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📝 Walkthrough

Walkthrough

A documentação atualiza a declaração de compatibilidade da linha 3.x e reorganiza os guias de migração e uso em inglês e português. Os READMEs resumem instalação e recursos, atualizam exemplos e direcionam para a documentação detalhada. O CI passa a enviar cobertura ao Codecov por OIDC.

Changes

Documentação da linha 3.x

Layer / File(s)	Summary
Resumo, exemplos e referências dos READMEs README.md, README.pt-BR.md	Os READMEs resumem recursos e instalação, atualizam os exemplos para usar customer_name e incluem orientação sobre FluentMapper.Validate(). As páginas direcionam para os guias de uso, migração e compatibilidade.
Escopo e compatibilidade da migração COMPATIBILITY.md, MIGRATION.md, MIGRATION.pt-BR.md	A declaração de compatibilidade informa que a linha 3.x mantida segue Semantic Versioning. Os guias descrevem a migração de 2.x para 3.x, as versões e os pacotes documentados e a continuidade dos mapeamentos raiz históricos.
Recursos e comportamentos na migração MIGRATION.md, MIGRATION.pt-BR.md	Os guias descrevem os efeitos dos metadados de persistência e o uso de materialização, perfis, conversores, geração, configurações isoladas, DI e Dommel.
Etapas de migração e validação MIGRATION.md, MIGRATION.pt-BR.md	Os guias incluem etapas de atualização e validação. O guia em inglês amplia a lista de verificação para consultas, Dommel e cenários de trimming e Native AOT.
Guias de uso dos recursos 3.x USAGE.md, USAGE.pt-BR.md	Os guias documentam mappings, consultas controladas pelo FluentMap, persistência, geração, configuração, DI, analyzers e limites de compatibilidade descritos.

Configuração de cobertura no CI

Layer / File(s)	Summary
Envio e configuração de cobertura .github/workflows/ci.yml, codecov.yml	O job Sonar envia o relatório XML ao Codecov por OIDC e falha se o envio não for bem-sucedido. codecov.yml define metas e limites de cobertura, comportamento dos comentários, anotações e padrões ignorados.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Other

Merge Risk: 🔵 Low · up to 62303

A pull request that fails the Sonar Quality Gate may lose its Codecov report despite having valid coverage. Preserve the upload after a successful coverage check, even when Sonar fails.

Architecture Summary

Architecture risk: 🔵 Low · up to 62303

The change affects 8 systems.

Changed systems: codecov.yml, COMPATIBILITY.md, MIGRATION.md, MIGRATION.pt-BR.md, README.md, README.pt-BR.md, USAGE.md, USAGE.pt-BR.md

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — codecov.yml (service) was modified; 1 changed file maps to changed impact.
• observed — COMPATIBILITY.md (service) was modified; 1 changed file maps to changed impact.
• observed — MIGRATION.md (service) was modified; 1 changed file maps to changed impact.
• observed — MIGRATION.pt-BR.md (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in COMPATIBILITY.md: A documentação troca a afirmação de que a linha 3.0 fork-owned publicou versões estáveis até 3.0.3 pela declaração de que a linha 3.x mantida segue Semantic Versioning; mantém a referência aos limites de compatibilidade pública.
• observed — Modified behavior in MIGRATION.md: O título e a introdução agora identificam a migração de 2.x para 3.x e esclarecem que mapas históricos de nível raiz normalmente não exigem alterações de código; a adoção de recursos novos é opcional.
• observed — Modified behavior in MIGRATION.md: Foram adicionadas orientações pré-upgrade para verificar versões de Dapper e Dommel, manter os pacotes FluentMap na mesma versão e identificar cenários específicos. O guia informa as faixas de suporte documentadas e remete à compatibilidade para certificações de provedores.
• observed — Modified behavior in MIGRATION.md: Foi incluído um roteiro mínimo com validação da configuração, compilação e testes, além de uma tabela de decisão que associa usos como Dommel, mapas aninhados, conversores, múltiplas configurações, DI e AOT às ações de migração correspondentes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	O título descreve claramente a principal alteração: a reorganização da documentação de uso e migração. Ele é conciso e está relacionado ao objetivo central do pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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SonarQube Cloud success

The SonarQube Cloud Quality Gate passed for this PR.

Quality Gate status: OK

Metric	Status	Actual	Threshold
new_reliability_rating	OK	1	1
new_security_rating	OK	1	1
new_maintainability_rating	OK	1	1
new_duplicated_lines_density	OK	0.0	3
new_security_hotspots_reviewed	OK	100.0	100

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🔇 Additional comments (2)

README.md (1)

4-4: LGTM!

Also applies to: 7-8

README.pt-BR.md (1)

4-4: LGTM!

Also applies to: 7-8