Carry main's session refresh, provider maintenance, runtime diagnostics,
composer focus, preview, usage, and mobile outbox fixes into the v2 branch.
Keep queue/steer submission, composer-only task progress, v2 subagent cards,
and LegendList scroll ownership.

Project thread and shell events before transport buffering while retaining
full durable history. Dismiss native questions when provider turns finish,
with a transaction guard that preserves answers submitted concurrently.
Port Claude limit notices and Codex file approval details to v2 adapters.

Validated with focused server, web, mobile, client-runtime, shared, desktop,
and marketing tests; affected package typechecks and scoped lint pass.
All 349 branch commits retain their authors and messages. Migration files
and the previous worktree-fetch, stash, panel, and mobile inset fixes remain
unchanged.