Compute batching (#849)

### Compute Batch Submission
- Consolidate duplicated action submission logic in `httpcomputeservice` into a single `HandleSubmitAction` supporting both single-action and batch (actions array) payloads
- Group actions by queue in `RemoteHttpRunner` and submit as batches with configurable chunk size, falling back to individual submission on failure
- Extract shared helpers: `MakeErrorResult`, `ValidateQueueForEnqueue`, `ActivateActionInQueue`, `RemoveActionFromActiveMaps`

### Retracted Action State
- Add `Retracted` state to `RunnerAction` for retry-free rescheduling — an explicit request to pull an action back and reschedule it on a different runner without incrementing `RetryCount`
- Implement idempotent `RetractAction()` on `RunnerAction` and `ComputeServiceSession`
- Add `POST jobs/{lsn}/retract` and `queues/{queueref}/jobs/{lsn}/retract` HTTP endpoints
- Add state machine documentation and per-state comments to `RunnerAction`

### Compute Race Fixes
- Fix race in `HandleActionUpdates` where actions enqueued between session abandon and scheduler tick were never abandoned, causing `GetActionResult` to return 202 indefinitely
- Fix queue `ActiveCount` race where `NotifyQueueActionComplete` was called after releasing `m_ResultsLock`, allowing callers to observe stale counters immediately after `GetActionResult` returned OK

### Logging Optimization and ANSI improvements
- Improve `AnsiColorStdoutSink` write efficiency — single write call, dirty-flag flush, `RwLock` instead of `std::mutex`
- Move ANSI color emission from sink into formatters via `Formatter::SetColorEnabled()`; remove `ColorRangeStart`/`End` from `LogMessage`
- Extract color helpers (`AnsiColorForLevel`, `StripAnsiSgrSequences`) into `helpers.h`
- Strip upstream ANSI SGR escapes in non-color output mode. This enables colour in log messages without polluting log files with ANSI control sequences
- Move `RotatingFileSink`, `JsonFormatter`, and `FullFormatter` from header-only to pimpl with `.cpp` files

### CLI / Exec Refactoring
- Extract `ExecSessionRunner` class from ~920-line `ExecUsingSession` into focused methods and a `ExecSessionConfig` struct
- Replace monolithic `ExecCommand` with subcommand-based architecture (`http`, `inproc`, `beacon`, `dump`, `buildlog`)
- Allow parent options to appear after subcommand name by parsing subcommand args permissively and forwarding unmatched tokens to the parent parser

### Testing Improvements
- Fix `--test-suite` filter being ignored due to accumulation with default wildcard filter
- Add test suite banners to test listener output
- Made `function.session.abandon_pending` test more robust

### Startup / Reliability Fixes
- Fix silent exit when a second zenserver instance detects a port conflict — use `ZEN_CONSOLE_*` for log calls that precede `InitializeLogging()`
- Fix two potential SIGSEGV paths during early startup: guard `sentry_options_new()` returning nullptr, and throw on `ZenServerState::Register()` returning nullptr instead of dereferencing
- Fail on unrecognized zenserver `--mode` instead of silently defaulting to store

### Other
- Show host details (hostname, platform, CPU count, memory) when discovering new compute workers
- Move frontend `html.zip` from source tree into build directory
- Add format specifications for Compact Binary and Compressed Buffer wire formats
- Add `WriteCompactBinaryObject` to zencore
- Extended `ConsoleTui` with additional functionality
- Add `--vscode` option to `xmake sln` for clangd / `compile_commands.json` support
- Disable compute/horde/nomad in release builds (not yet production-ready)
- Disable unintended `ASIO_HAS_IO_URING` enablement
- Fix crashpad patch missing leading whitespace
- Clean up code triggering gcc false positives

7 files changed, 24 insertions, 36 deletions

diff --git a/src/zenserver/compute/computeserver.cpp b/src/zenserver/compute/computeserver.cpp
index 724ef9ad2..d1875f41a 100644
--- a/src/zenserver/compute/computeserver.cpp
+++ b/src/zenserver/compute/computeserver.cpp
@@ -721,21 +721,7 @@ ZenComputeServer::InitializeOrchestratorWebSocket()
 		return;
 	}
 
-	// Convert http://host:port → ws://host:port/orch/ws
-	std::string WsUrl = m_CoordinatorEndpoint;
-	if (WsUrl.starts_with("http://"))
-	{
-		WsUrl = "ws://" + WsUrl.substr(7);
-	}
-	else if (WsUrl.starts_with("https://"))
-	{
-		WsUrl = "wss://" + WsUrl.substr(8);
-	}
-	if (!WsUrl.empty() && WsUrl.back() != '/')
-	{
-		WsUrl += '/';
-	}
-	WsUrl += "orch/ws";
+	std::string WsUrl = HttpToWsUrl(m_CoordinatorEndpoint, "/orch/ws");
 
 	ZEN_INFO("establishing WebSocket link to orchestrator at {}", WsUrl);
 
diff --git a/src/zenserver/frontend/html/compute/compute.html b/src/zenserver/frontend/html/compute/compute.html
index 66c20175f..c07bbb692 100644
--- a/src/zenserver/frontend/html/compute/compute.html
+++ b/src/zenserver/frontend/html/compute/compute.html
@@ -6,6 +6,7 @@
     <title>Zen Compute Dashboard</title>
     <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/chart.umd.min.js"></script>
     <link rel="stylesheet" type="text/css" href="../zen.css" />
+    <script src="../util/sanitize.js"></script>
     <script src="../theme.js"></script>
     <script src="../banner.js" defer></script>
     <script src="../nav.js" defer></script>
@@ -456,11 +457,6 @@
         });
 
         // Helper functions
-        function escapeHtml(text) {
-            var div = document.createElement('div');
-            div.textContent = text;
-            return div.innerHTML;
-        }
 
         function formatBytes(bytes) {
             if (bytes === 0) return '0 B';
diff --git a/src/zenserver/frontend/html/compute/hub.html b/src/zenserver/frontend/html/compute/hub.html
index 32e1b05db..620349a2b 100644
--- a/src/zenserver/frontend/html/compute/hub.html
+++ b/src/zenserver/frontend/html/compute/hub.html
@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="stylesheet" type="text/css" href="../zen.css" />
+    <script src="../util/sanitize.js"></script>
     <script src="../theme.js"></script>
     <script src="../banner.js" defer></script>
     <script src="../nav.js" defer></script>
@@ -62,12 +63,6 @@
         const BASE_URL = window.location.origin;
         const REFRESH_INTERVAL = 2000;
 
-        function escapeHtml(text) {
-            var div = document.createElement('div');
-            div.textContent = text;
-            return div.innerHTML;
-        }
-
         function showError(message) {
             document.getElementById('error-container').innerHTML =
                 '<div class="error">Error: ' + escapeHtml(message) + '</div>';
diff --git a/src/zenserver/frontend/html/compute/orchestrator.html b/src/zenserver/frontend/html/compute/orchestrator.html
index a519dee18..d1a2bb015 100644
--- a/src/zenserver/frontend/html/compute/orchestrator.html
+++ b/src/zenserver/frontend/html/compute/orchestrator.html
@@ -4,6 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="stylesheet" type="text/css" href="../zen.css" />
+    <script src="../util/sanitize.js"></script>
     <script src="../theme.js"></script>
     <script src="../banner.js" defer></script>
     <script src="../nav.js" defer></script>
@@ -128,12 +129,6 @@
         const BASE_URL = window.location.origin;
         const REFRESH_INTERVAL = 2000;
 
-        function escapeHtml(text) {
-            var div = document.createElement('div');
-            div.textContent = text;
-            return div.innerHTML;
-        }
-
         function showError(message) {
             document.getElementById('error-container').innerHTML =
                 '<div class="error">Error: ' + escapeHtml(message) + '</div>';
diff --git a/src/zenserver/frontend/html/util/sanitize.js b/src/zenserver/frontend/html/util/sanitize.js
new file mode 100644
index 000000000..1b0f32e38
--- /dev/null
+++ b/src/zenserver/frontend/html/util/sanitize.js
@@ -0,0 +1,9 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+// Shared utility functions for compute dashboard pages.
+
+function escapeHtml(text) {
+	var div = document.createElement('div');
+	div.textContent = text;
+	return div.innerHTML;
+}
diff --git a/src/zenserver/main.cpp b/src/zenserver/main.cpp
index 26ae85ae1..9d786c209 100644
--- a/src/zenserver/main.cpp
+++ b/src/zenserver/main.cpp
@@ -319,6 +319,11 @@ main(int argc, char* argv[])
 		{
 			ServerMode = kTest;
 		}
+		else if (argv[1][0] != '-')
+		{
+			fprintf(stderr, "unknown mode '%s'. Available modes: hub, store, compute, proxy, test\n", argv[1]);
+			return 1;
+		}
 	}
 
 	switch (ServerMode)
diff --git a/src/zenserver/xmake.lua b/src/zenserver/xmake.lua
index fe279ebb2..b619c5548 100644
--- a/src/zenserver/xmake.lua
+++ b/src/zenserver/xmake.lua
@@ -19,7 +19,7 @@ target("zenserver")
     add_headerfiles("**.h")
     add_rules("utils.bin2c", {extensions = {".zip"}})
     add_files("**.cpp")
-    add_files("frontend/html.zip")
+    add_files("$(buildir)/frontend/html.zip")
     add_files("zenserver.cpp", {unity_ignored  = true })
 
     if is_plat("linux") and not (get_config("toolchain") or ""):find("clang") then
@@ -84,7 +84,8 @@ target("zenserver")
    
     on_load(function(target)
         local html_dir = path.join(os.projectdir(), "src/zenserver/frontend/html")
-        local zip_path = path.join(os.projectdir(), "src/zenserver/frontend/html.zip")
+        local zip_dir = path.join(os.projectdir(), get_config("buildir") or "build", "frontend")
+        local zip_path = path.join(zip_dir, "html.zip")
 
         -- Check if zip needs regeneration
         local need_update = not os.isfile(zip_path)
@@ -100,18 +101,19 @@ target("zenserver")
 
         if need_update then
             print("Regenerating frontend zip...")
+            os.mkdir(zip_dir)
             os.tryrm(zip_path)
 
             import("detect.tools.find_7z")
             local cmd_7z = find_7z()
             if cmd_7z then
-                os.execv(cmd_7z, {"a", "-mx0", zip_path, path.join(html_dir, ".")})
+                os.execv(cmd_7z, {"a", "-mx0", "-bso0", zip_path, path.join(html_dir, ".")})
             else
                 import("detect.tools.find_zip")
                 local zip_cmd = find_zip()
                 if zip_cmd then
                     local oldir = os.cd(html_dir)
-                    os.execv(zip_cmd, {"-r", "-0", zip_path, "."})
+                    os.execv(zip_cmd, {"-r", "-0", "-q", zip_path, "."})
                     os.cd(oldir)
                 else
                     raise("Unable to find a suitable zip tool (need 7z or zip)")