Release v0.29.0

What's Changed

• fix(pi): refresh context after compaction by @swear01 in #1634
• fix(pi): offer model-accurate thinking levels in the create-session form by @KorenKrita in #1626
• feat(codex): mid-turn Steer via app-server turn/steer (#888) by @swear01 in #1606

Full Changelog: v0.28.0...v0.29.0