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Introduces a common `ZenServiceClient` RAII wrapper for zen CLI commands that interact with a zenserver instance. CLI operations (admin, builds, cache, exec, hub, info, projectstore, trace, ui, version, vfs, workspaces) automatically register sessions so they become visible in the server's session list, and forward log output to the server's session log endpoint.
All session HTTP I/O (announce, remove, log batches) runs on a single background worker thread, so CLI startup and shutdown never block on server availability.
### Key changes
- **`ZenServiceClient`** — new RAII class that wraps host resolution, HTTP client creation, and session lifecycle (register on connect, remove on exit). Replaces ad-hoc boilerplate across all command files that talk to a server, including the new `trace` subcommands (`start`, `stop`, `status`).
- **Async session I/O** — `SessionsServiceClient` now owns a single worker thread and command queue. `Announce()`, `Remove()`, and `UpdateMetadata()` enqueue commands and return immediately. The worker creates one `HttpClient` with a 5-second total timeout, bounding any individual request. Eliminates main-thread stalls when the server is unreachable.
- **Session log forwarding** — `SessionLogSink` is a thin enqueuer that posts log messages to the same worker queue (no separate thread or HTTP client). Log levels are serialized as integers; the server-side ingest handles both string and integer formats for backwards compatibility, with bounds checking on integer values.
- **Build & projectstore session registration** — Long-running `builds` and projectstore cache (oplog-download) connections register sessions too, making them visible alongside regular CLI command sessions.
### Cleanup
- Extract `SetupCacheSession` helper on `StorageInstance` to reduce duplication.
- Remove unused `HttpClient` reference in ui command.
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This PR adds end-to-end Unix domain socket (UDS) support, allowing zen CLI to discover and connect to UDS-only servers automatically.
- **`unix://` URI scheme in zen CLI**: The `-u` / `--hosturl` option now accepts `unix:///path/to/socket` to connect to a zenserver via a Unix domain socket instead of TCP.
- **Per-instance shared memory for extended server info**: Each zenserver instance now publishes a small shared memory section (keyed by SessionId) containing per-instance data that doesn't fit in the fixed-size ZenServerEntry -- starting with the UDS socket path. This is a 4KB pagefile-backed section on Windows (`Global\ZenInstance_{sessionid}`) and a POSIX shared memory object on Linux/Mac (`/UnrealEngineZen_{sessionid}`).
- **Client-side auto-discovery of UDS servers**: `zen info`, `zen status`, etc. now automatically discover and prefer UDS connections when a server publishes a socket path. Servers running with `--no-network` (UDS-only) are no longer invisible to the CLI.
- **`kNoNetwork` flag in ZenServerEntry**: Servers started with `--no-network` advertise this in their shared state entry. Clients skip TCP fallback for these servers, and display commands (`ps`, `status`, `top`) show `-` instead of a port number to indicate TCP is not available.
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- Improvement: Use consistent language for command line argument parsing errors
- Improvement: Changed zen command parsing errors to output help first and error last to make it easier to spot the error
- Improvement: Refactor zen command return codes to conform to valid Linux range (0-255)
kSuccess = 0,
kOtherError = 1,
kBadInput = 2,
kOutOfMemory = 16,
kOutOfDisk = 17,
kAssertError = 70,
kHttpOtherClientError = 80,
kHttpCantConnectError = 81,
kHttpNotFound = 66, // NotFound(404)
kHttpUnauthorized = 77, // Unauthorized(401),
kHttpSLLError = 82,
kHttpForbidden = 83, // Forbidden(403)
kHttpTimeout = 84, // RequestTimeout(408)
kHttpConflict = 85, // Conflict(409)
kHttpNoHost = 86,
kHttpOtherServerError = 90,
kHttpInternalServerError = 91, // InternalServerError(500)
kHttpServiceUnavailable = 69, // ServiceUnavailable(503)
kHttpBadGateway = 92, // BadGateway(502)
kHttpGatewayTimeout = 93, // GatewayTimeout(504)
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* add color coded logging level to console output (for warn/err/crit levels)
* clean up console output
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command (#651)
* be safe and use ToText() rather than AsText() when getting http responses
* Added `--copy-log`, `--copy-cache-log` and `copy-http-log` option to zen logs command to copy logs from a local running zen server instance
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this also adds a central, shared folder for storing information which may be found by any instance on the host. The directory is currently located alongside the default install and state directory.
Initially this is used to store a collection of known `root_manifest` locations and a copy of the latest manifest version which allow us to find all known locations where zen state is present.
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