Docs: Make release tagging version-neutral

[huronat]

What this does

Replaces the stale copyable v0.2.0 tag command with a version-neutral vX.Y.Z example before the v0.2.5 tag is created.

This is the single valid post-merge review finding from PR #17. It changes documentation only; the 0.2.5 Cargo and Helm versions remain unchanged.

Verification

• git diff --check
• branch is based on the merged PR Release: Prepare v0.2.5 #17 main commit

Summary by CodeRabbit

• Documentation
  • Generalized the release-tagging example to use a version placeholder, making the instructions reusable for future releases.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2d95f50e-8942-442f-b69b-e4bf15fbacf1

📥 Commits

Reviewing files that changed from the base of the PR and between 1ce7053 and 26c9f1e.

📒 Files selected for processing (1)

• CONTRIBUTING.md

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📝 Walkthrough

Walkthrough

The release instructions in CONTRIBUTING.md replace the fixed v0.2.0 tag with the generic vX.Y.Z placeholder in both tagging and push examples.

Changes

Release documentation

Layer / File(s)	Summary
Generalize release tag examples CONTRIBUTING.md	The release commands now use vX.Y.Z for both creating and pushing a tag.

Suggested reviewers: svonava

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/release-v0.2.5

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