1.50.0

What's Changed

• fix(kosong): omit empty anthropic-beta header when no beta features declared by @7Sageer in #2580
• chore(release): bump kosong to 0.56.0 by @jackfish212 in #2581
• feat(shell): deprecation-aware update flow with one-key migration to Kimi Code by @jackfish212 in #2630
• chore(release): bump kimi-cli to 1.50.0 by @sailist in #2632

Full Changelog: 1.49.0...1.50.0