fix(release): validate custom version input and include all changelog entries

[assagman]

Summary

Addresses two valid review comments from PR #2:

• Validate custom_version input — ensures strict semver format (X.Y.Z or v1.2.3), strips v prefix, and fails fast with clear error on invalid input
• Remove head -10 truncation — changelog "Changed" section now includes all non-conventional commits instead of silently truncating

Changes

File	Change
release-pr.yml	Add semver validation for inputs.custom_version
release-pr.yml	Remove head -10 from OTHERS changelog generation

Testing

• Trigger release-pr workflow with invalid custom version (e.g., abc) — should fail
• Trigger release-pr workflow with valid custom version (e.g., v2.0.0) — should succeed
• Verify changelog includes all "Changed" entries on next release PR

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[Copilot]

Pull request overview

This PR addresses two issues from a previous review: adds validation for the custom_version workflow input to ensure it follows strict semver format, and removes the head -10 truncation from the changelog generation to include all non-conventional commits.

Changes:

• Add semver validation to custom_version input (strips v prefix, validates X.Y.Z format, fails with clear error on invalid input)
• Remove head -10 truncation from OTHERS changelog generation to include all non-conventional commits

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