## Why
Clients starting delegated work need to attribute descendant turns to the original turn and retain that attribution through completion and history reads.
## What changed
- Accept optional `parentTurnId` and `rootTurnId` in `turn/start`, and expose `rootTurnId` on returned turns and lifecycle notifications.
- Default new turns to their own root when none is supplied. Preserve the active turn's root when steering, ignoring incoming lineage fields.
- Carry root IDs through completion, interruption, recovery, and fork boundaries, and persist them for paginated history reads. Leave unknown roots null in older history.
- Update protocol schemas and generated TypeScript and Python bindings.
## Testing
Extend coverage for default and explicit roots, steering without changing lineage, interrupted and recovered turns, history reads after restart in both history modes, nested fork pagination, and compatibility with older database writers.
GitOrigin-RevId: f1a570a12bd11742929fd2e8b017e5d35aa07dcb
## What changed
- Add a `writeStdin` Guardian action carrying the approval, process, input, and working-directory details.
- Distinguish `command` and `writeStdin` execution approval requests while defaulting missing kinds to `command` for compatibility with older events.
- Render terminal-input review progress, denials, timeouts, and retry actions in the TUI, and record the action separately in analytics.
- Keep terminal-input reviews as child approvals so they do not change the parent command item's lifecycle or reconstructed history.
## Testing
- Cover Guardian serialization, app-server protocol conversion, command history reconstruction, analytics classification, and TUI review flows for terminal input.
GitOrigin-RevId: b083d5e2963bdd23b928644ec03c7eb68ebf2950
## Why
The per-thread replay buffer limited its event count, but streamed agent-message
deltas could still retain an unbounded amount of text while a thread was
inactive.
## What changed
- Coalesce adjacent deltas for the same thread, turn, and item into chunks of up
to 4 KiB.
- Limit buffered agent-message deltas to 256 KiB, discard a single delta larger
than that limit, and evict the oldest events when either buffer limit is
exceeded.
- Keep pending input and approval state in sync when eviction removes the
corresponding request, including clearing side-thread status indicators.
## Testing
Added coverage for delta coalescing, byte-based eviction, oversized deltas,
replaying only retained text, and side-thread status updates after eviction.
GitOrigin-RevId: 88d85353a124467d467822d2fd9854312b68d547
Eddie Chen