Add CI draft release job for version tags

[dominicletz]

Summary

• Add a tag-gated create_draft_release CI job that runs after build and smoke tests pass on v* tag pushes.
• Introduce deployment/stage_release_artifacts.sh to map CI artifact downloads into the inputs expected by deployment/extract.exs, producing the same 8 release assets as existing releases.
• Introduce deployment/release_notes.sh to generate draft release notes from git commits since the previous v* tag (one line per commit).

Test plan

• Local dry-run of staging + extract.exs produces all 8 expected out/ assets
• Local dry-run of release_notes.sh v1.18.7 prints expected commit log
• CI workflow YAML validates
• Push a new v* tag after merge and confirm a draft release is created with 8 assets and commit-log body

Made with Cursor

[gemini-code-assist]

Code Review

This pull request introduces two new deployment scripts: release_notes.sh for generating release logs and stage_release_artifacts.sh for packaging and staging release artifacts. The review feedback highlights critical improvements for portability and robustness, including handling potential undefined behavior in awk when getline reaches EOF, resolving relative staging paths to absolute paths to prevent subshell failures, and replacing the GNU-specific find -quit flag with a portable alternative to ensure compatibility with macOS.

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