feat(InterpolationCodeWriter): add non-nullable WriteLine overloads for all primitive types

[skarllot]

Summary

• Add WriteLine non-nullable overloads for bool, char, byte, sbyte, short, ushort, int, uint, long, ulong, float, double, and decimal to match the existing Write non-nullable API
• Add tests covering all 13 new non-nullable overloads
• Add tests covering all previously untested nullable WriteLine overloads (char?, byte?, sbyte?, short?, ushort?, uint?, long?, ulong?, float?, double?, decimal? — both value and null cases — plus the missing bool? null case)

Test plan

• All 92 tests pass on net8.0 and net10.0
• Each new non-nullable overload has a dedicated test verifying value + newline output
• Each previously untested nullable overload has tests for both the has-value and null cases

🤖 Generated with Claude Code

Summary by CodeRabbit

Release Notes

• New Features
  • Extended WriteLine method with overloads for all primitive data types (booleans, characters, integers, floating-point numbers, decimals) and their nullable variants, enabling more convenient value output.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

Added 26 new WriteLine method overloads to SourceTextWriter for various primitive types and their nullable variants. Each overload writes the value and appends a newline. Comprehensive test coverage added for all overloads. Version bumped from 2.0 to 2.1.

Changes

Cohort / File(s)	Summary
SourceTextWriter WriteLine Overloads src/InterpolationCodeWriter/SourceTextWriter.WriteLine.cs	Added 26 new WriteLine overload methods for bool, char, all integral types (byte, sbyte, short, ushort, int, uint, long, ulong), floating-point types (float, double), decimal, string, object, and their nullable variants. Each overload calls Write(...) then appends newline.
WriteLine Test Suite tests/InterpolationCodeWriter.Tests/SourceTextWriterTest.WriteLine.cs	Added 336 lines of test cases covering all 26 WriteLine overloads, verifying correct value output with newline appending and proper null handling for nullable variants.
Version Update version.json	Updated version field from "2.0" to "2.1".

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Possibly related PRs

• fix(InterpolationCodeWriter): normalize line endings when indentation is zero #230: Introduced newline normalization logic in Write methods that these new WriteLine overloads depend upon for consistent behavior.

Suggested reviewers

• fgodoy-lepaho

Poem

🐰 A flutter of WriteLine, so neat and so fine,
Twenty-six types now each have their time,
From bool to decimal, from int to the rest,
Each one gets a line—we've passed the test!
Version two-point-one, our achievement's defined,
More methods, more magic, perfectly aligned! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 28.85% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding non-nullable WriteLine overloads for primitive types, which aligns with the comprehensive set of 13 new method overloads added to SourceTextWriter.
Description check	✅ Passed	The description covers the key aspects: details the 13 new non-nullable overloads, describes tests added for both new and previously untested nullable overloads, includes test results (92 tests pass on net8.0 and net10.0), and confirms local build success with checkmarks.

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✨ Finishing Touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/writeline-overloads

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