chore: release v0.2.0

[mertushka]

Purpose

Prepare the 0.2.0 release after merging the typed libdatachannel extension work.

Behavior Impact

• Updates package version metadata from 0.1.7 to 0.2.0.
• No runtime, native, WPT, or browser behavior changes in this PR.

Native / WPT Impact

• Version metadata only.
• Previous feature PR Conformance passed on dd72ab6: https://github.com/mertushka/webrtc-node/actions/runs/27579644240

Validation

• npm run check
• npm run native:check
• npm run build
• npm test
• npm run api:check
• npm run types:check
• npm run pack:check
• npm run e2e:chrome
• npm run wpt:selection:check
• npm run wpt:smoke
• npm run wpt:smoke:check