[rushd][Epic] rushd — serve... | microsoft/rushstack

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Start with the RFC in #5863 and the dependency status in this epic, then read the outstanding workstreams #5898–#5901. This is an architectural coordination issue rather than a self-contained change. Done means the listed daemon default, fallback, transparency, and Rush 6 cutover conditions are met.

Written by the indexing model from the issue text.

Re-architect Rush from a CLI-first tool into a server-first system: a long-lived per-workspace
daemon (rushd) owns the engine and warm build state; thin, presentation-owning clients (CLI first;
MCP/web later) talk a presentation-free protocol. Delivered as new split packages merged
incrementally into main at 0.x, culminating in a Rush 6 cutover.

Design rationale & discussion: #5863 (RFC).

Hard dependencies

Watch-mode overhaul (#5378) merged — provides the stateful IOperationGraph
(setEnabledStates, scheduleIterationAsync, invalidateOperations, abortCurrentIterationAsync,
closeRunnersAsync) and OperationGraphHooks (onIdle, onExecutionStatesUpdated).
Rush Reporter Overhaul (#5858) — supplies the presentation-free event contract & wire adapter;
its "daemon-aligned major default flip" is the Rush 6 cutover.

Workstreams (sub-issues)

WS0 (#5895) — Upstream engine prerequisites (in rush-lib)
WS1 (#5896) — Wire layer: protocol, transport & presentation
WS2 (#5897) — Daemon host, routing & scheduling
WS3 (#5898) — Daemon lifecycle, reload & warm-set
WS4 (#5899) — CLI client & command surface
WS5 (#5900) — Rush 6 cutover: testing, observability & migration
WS6 (#5901) — Web UX & MCP bridge

Definition of done for the Epic

rush/rushx default to the daemon with a permanent in-process fallback (--no-daemon/RUSH_DAEMON=0).
The transparency bar (#5900) passes on the flipped bins.
Shipped as Rush 6.0.0 in the same major as #5858 phase 6.

[rushd][Epic] rushd — server-first re-architecture (daemon + thin clients)

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