* fix: gstack-team-init detects and removes vendored copies in team mode
When running gstack-team-init inside a repo with a vendored
.claude/skills/gstack/, the script now auto-detects and removes it:
git rm --cached, add to .gitignore, rm -rf. Also adds team_mode config
key to setup --team/--no-team, and makes gstack-upgrade Step 4.5
team-mode aware (remove instead of sync).
Includes 5 new integration tests for the vendored copy migration.
* chore: bump version and changelog (v0.15.14.0)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>