Release v0.30.0

What's Changed

• fix(windows): launch package manager shims safely by @just-cameron in #3600
• fix(cli): omit unavailable memory block counts by @overlord-letta in #3607
• fix(listener): recover stalled split stream reconnects by @overlord-letta in #3598
• fix(cli): reject implicit headless positional prompts by @just-cameron in #3611
• feat(sdk): support request-scoped client toolsets by @cpacker in #3609
• ci: cascade stable releases to Agent SDK and ACP by @overlord-letta in #3610
• chore: bump version to 0.30.0 by @github-actions[bot] in #3615

Full Changelog: v0.29.13...v0.30.0