v0.4.3

Changelog

Features

• 70f06dd: feat(agentcore): add SubAgentProgressEvent + progress emitter ctx carrier (#453) (#460) (@smallnest)
• 7a5398f: feat(headless): print sub-agent progress to stderr (#457) (#463) (@smallnest)
• 42082a5: feat(prompt): advertise task tool fan-out in system prompt (#458) (#461) (@smallnest)
• b4ce694: feat(runtime): add generic task tool with semaphore + nesting guard (#454) (#459) (@smallnest)
• 51cc439: feat(runtime): sub-agent progress reporting via loop-injected emitter (#455) (#462) (@smallnest)
• c23bc08: feat(tui): multi-line subagent status panel (#456) (#464) (@smallnest)
• d26de13: feat(tui): prompt history nav + subagent panel/credential fixes (@smallnest)