fix(ci): revert 1.0.7 release and fix workflow bugs

[JasonXuDeveloper]

Summary

Reverts the broken 1.0.7 release and fixes the underlying workflow bugs.

Changes

1. Revert 1.0.7 release

• Removes incorrect changelog entries (included all commits instead of since last release)
• Restores README files to v1.0.5 content
• Reverts package.json versions to 1.0.6/1.0.0

2. Fix base tag detection

Before (broken): Used package.json version as base tag

CURRENT_CORE=$(jq -r '.version' .../package.json)
BASE_TAG="$CURRENT_CORE"  # e.g., "1.0.6" - but this tag didn't exist!

After (fixed): Find latest existing tag dynamically

BASE_TAG=$(git tag -l '[0-9]*.[0-9]*.[0-9]*' | sort -V | tail -n 1)
# Returns "1.0.5" - the actual latest tag

This handles major/minor version bumps correctly (e.g., 1.0.5 → 2.0.0).

3. Fix deprecated action warning

Before: actions/create-release@v1 (uses deprecated set-output)

After: gh release create (modern, no warnings)

Test plan

• Merge this PR
• Delete 1.0.7 tag and release
• Run release workflow with core_version=1.0.8 and util_version=1.0.2
• Verify changelog only includes commits since 1.0.5
• Verify no CI warnings about deprecated commands

🤖 Generated with Claude Code

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

[github-actions]

Unity Test Results

✅ EditMode: All tests passed
✅ PlayMode: All tests passed

Unity Version: 2022.3.55f1
Project Path: UnityProject

✅ All tests passed! The PR is ready for review.

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