Add TXT CSV and JSON chapter

[RamonRDR]

Summary

• continue Phase 7: Errors, Files, and Modules with Chapter 04, Working with TXT, CSV, and JSON, in English, Brazilian Portuguese, and Spanish
• distinguish file access from data-format parsing and application validation
• teach simple line-oriented TXT contracts, precise newline handling, and the limits of custom text formats
• teach standard-library CSV reading/writing with reader, writer, DictReader, DictWriter, explicit conversions, dialect/delimiter awareness, quoting, and newline=""
• teach JSON values and Python mappings, load/loads/dump/dumps, Unicode output, indentation, decode errors, serialization limits, and round-trip caveats
• add four deterministic, non-interactive examples using temporary directories where real files are needed
• synchronize Phase 7 indexes, root/localized status pages, master learning paths, roadmaps, project-structure documents, and the approved example manifest
• keep Phase 7 in progress and set Imports, Modules, and Packages as the final planned chapter

Validation target

• aligned EN / PT-BR / ES chapter structure
• identical Python code blocks across the three chapter versions
• every fenced Python block syntax-checked
• 4 new executable examples
• 116 approved unattended examples
• exactly 23 changed files
• one focused commit based exactly on main at 90f314a2ca0ec499cd288257c8fc2bd4feb4a3f2
• Repository quality checks green on the final PR head

References

The chapter is grounded in the official Python 3.14 documentation for csv, json, and the tutorial sections on file I/O and structured JSON data.

[RamonRDR]

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Codex Review: Didn't find any major issues. Delightful!

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