Fix empty commit links in CLI release notes

[yosriady]

Motivation

• Release notes were rendering empty commit links (shown as ()) because the git log output used spaces as a delimiter while the parser expects a tab-separated subject and hash.

Description

• Use a real tab delimiter in git log by switching to --pretty=format:'%s%x09%h' so the loop parsing with IFS=$'\t' receives both subject and hash.
• Quote the previous-tag revision range ("${PREV_TAG}..HEAD") passed to git log to avoid shell word-splitting issues.
• Add an inline comment documenting why the delimiter must remain aligned with the release-note loop.

Testing

• Ran git diff --check which produced no whitespace or formatting errors.
• Validated the release-note generation by iterating git log output with IFS=$'\t' read -r message hash and asserting every hash was non-empty and no entry contained an empty () link, confirming generation for repository history (37 entries) succeeded.
• Confirmed the workflow file change is present and the delimiter regression check shows the parsed message and hash are both non-empty.

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Codex Task

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