v2.1.0 — tonk brand defaults

Full Changelog: v2.0.1...v2.1.0

v2.0.1 — Marketplace description fix

Shortens the action description to fit the Marketplace's 125-character limit. No functional changes; v2 now points here.

v2.0.0 — root action, Marketplace-ready

Breaking: the composite action moved to the repo root

• uses: zandoh/tonk@v2 replaces uses: zandoh/tonk/actions/discord-notify@v1
• The reusable workflow is unchanged in place: uses: zandoh/tonk/.github/workflows/notify.yml@v2
• v1 tags keep resolving to the old layout; nothing pinned to them breaks
• The action is renamed tonk Discord notify and carries Marketplace branding

No behavior changes — same inputs, same guard rails, same failure/recovery semantics.