docs(changelog): prepare release notes for v1.0.0-arsenal

[nanotaboada]

Summary

• Moves [Unreleased] placeholder content to a new [1.0.0 - Arsenal] - 2026-03-29 section in CHANGELOG.md
• Follows the same initial release pattern used by the .NET and Go sibling projects

Pre-Release Checklist

• Release branch created from master
• CHANGELOG.md updated with release notes
• Changes committed and pushed on the release branch

🤖 Generated with Claude Code

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This change is 

Summary by CodeRabbit

• Chores
  • Updated changelog to mark version 1.0.0 as released with initial release notes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 30f81285-ac43-48a7-8a06-22f1cde433d7

📥 Commits

Reviewing files that changed from the base of the PR and between 0bf70e0 and 7ac7d70.

📒 Files selected for processing (1)

• CHANGELOG.md

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Walkthrough

CHANGELOG.md was updated by restructuring the "Unreleased" section header, removing sub-sections for "Added", "Changed", and "Fixed", and adding a new release entry for version 1.0.0 dated 2026-03-29 with "Initial release" designation.

Changes

Cohort / File(s)	Summary
Changelog Documentation CHANGELOG.md	Restructured unreleased section header by removing sub-section categories and added version 1.0.0 release entry with initial release designation and README.md reference.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• PR #287: Directly modifies the same CHANGELOG.md file with identical changes to the "Unreleased" section structure and adds the 1.0.0 - Arsenal release entry.
• PR #284: Updates pre-commit workflow checklist to include manual CHANGELOG.md update instructions, establishing process documentation for changelog maintenance.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses Conventional Commits format (docs:), is descriptive of the main change (preparing release notes), is under 80 characters (57), and clearly relates to the changelog structure modification described in the PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v1.0.0-arsenal

• 🛠️ sync documentation: Commit on current branch
• 🛠️ sync documentation: Create PR
• 🛠️ enforce http error handling: Commit on current branch
• 🛠️ enforce http error handling: Create PR
• 🛠️ idiomatic review: Commit on current branch
• 🛠️ idiomatic review: Create PR
• 🛠️ verify api contract: Commit on current branch
• 🛠️ verify api contract: Create PR

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0bf70e0) to head (7ac7d70).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #291   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        28        28           
===========================================
  Files              2         2           
  Lines             77        77           
  Branches           8         8           
===========================================
  Hits              77        77           

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[nanotaboada]

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[coderabbitai]

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