release: v0.2.4

[George-iam]

Version bump 0.2.3 → 0.2.4

Previous v0.2.4 release failed npm publish because version wasn't bumped in package.json.

After merge

Delete existing v0.2.4 tag/release, then re-create:

git checkout main && git pull
gh release delete v0.2.4 --yes
git push --delete origin v0.2.4
git tag -d v0.2.4
git tag v0.2.4
git push origin v0.2.4
gh release create v0.2.4 --title "v0.2.4" --notes "Self-contained plugin bundle for Claude Code marketplace"

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