v0.3.9

What's Changed

• Chore: Auto-publish releases instead of drafts by @ghnmqdtg in #21
• Chore: Staging build pipeline + release version guard by @ghnmqdtg in #22
• Fix(app): Keep recording control bar at 50px on record start by @ghnmqdtg in #23
• Chore: Flatten monorepo to single-package repo + dead-file cleanup by @ghnmqdtg in #24
• Docs: Adopt feature → stg → main branch flow (remove dev tier) by @ghnmqdtg in #25
• Release: v0.3.9 — flatten monorepo, dead-file cleanup, staging pipeline by @ghnmqdtg in #26
• Fix(release): Pre-create GitHub release to avoid publish race by @ghnmqdtg in #27
• Release: v0.3.9 (retry) — with publish-race fix by @ghnmqdtg in #28

Full Changelog: v0.3.8...v0.3.9