Remove cargo-semver-checks dependency and workflow

[kixelated]

Summary

This PR removes the cargo-semver-checks tool and its associated CI workflow, simplifying the project's dependency management and CI pipeline.

Key Changes

• Removed semver.yml workflow: Deleted the GitHub Actions workflow that ran semver compatibility checks on pull requests to main
• Removed cargo-semver-checks installation: Removed cargo-semver-checks from the install justfile target
• Removed semver justfile target: Deleted the semver justfile recipe that ran cargo semver-checks check-release
• Removed cargo-semver-checks from flake.nix: Removed the dependency from the Nix development environment
• Updated documentation: Removed reference to cargo-semver-checks enforcement in CLAUDE.md

Rationale

The removal of cargo-semver-checks suggests a shift away from automated semantic versioning compatibility checks. Version management is now handled solely through release-plz, which provides a more integrated approach to versioning and changelog management.

https://claude.ai/code/session_01N3tPJPx4gNXCPwGhwoj5LR

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 85e84a61-e893-4e43-9b0f-1109ebee44e9

📥 Commits

Reviewing files that changed from the base of the PR and between a2b8a46 and c96914d.

📒 Files selected for processing (4)

• .github/workflows/semver.yml
• CLAUDE.md
• flake.nix
• justfile

💤 Files with no reviewable changes (3)

• CLAUDE.md
• flake.nix
• .github/workflows/semver.yml

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Walkthrough

The changes remove the cargo-semver-checks semantic versioning validation tool and its associated infrastructure from the project. This includes deletion of the GitHub Actions workflow file that executed semver checks on pull requests to main, removal of the tool from the development shell dependency list, deletion of the semver Just task, and removal of documentation describing the tool's role in the branching strategy. The changes span four files with a net removal of 32 lines.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Remove cargo-semver-checks dependency and workflow' directly and accurately describes the main changes in the PR, which are the removal of the cargo-semver-checks tool and its associated GitHub Actions workflow.
Description check	✅ Passed	The description is detailed and directly related to the changeset, explaining the removal of cargo-semver-checks across multiple files and providing clear rationale for the changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/remove-semver-workflow-QkTUk

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch claude/remove-semver-workflow-QkTUk

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