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

1 files changed, 20 insertions, 3 deletions

diff --git a/src/zencompute/runners/remotehttprunner.h b/src/zencompute/runners/remotehttprunner.h
index 9119992a9..c17d0cf2a 100644
--- a/src/zencompute/runners/remotehttprunner.h
+++ b/src/zencompute/runners/remotehttprunner.h
@@ -14,9 +14,11 @@
 #	include <zencore/workthreadpool.h>
 #	include <zencore/zencore.h>
 #	include <zenhttp/httpclient.h>
+#	include <zenhttp/httpwsclient.h>
 
 #	include <atomic>
 #	include <filesystem>
+#	include <memory>
 #	include <thread>
 #	include <unordered_map>
 
@@ -32,7 +34,7 @@ namespace zen::compute {
 
   */
 
-class RemoteHttpRunner : public FunctionRunner
+class RemoteHttpRunner : public FunctionRunner, private IWsClientHandler
 {
 	RemoteHttpRunner(RemoteHttpRunner&&) = delete;
 	RemoteHttpRunner& operator=(RemoteHttpRunner&&) = delete;
@@ -45,7 +47,7 @@ public:
 	~RemoteHttpRunner();
 
 	virtual void									Shutdown() override;
-	virtual void									RegisterWorker(const CbPackage& WorkerPackage) override;
+	[[nodiscard]] virtual bool						RegisterWorker(const CbPackage& WorkerPackage) override;
 	[[nodiscard]] virtual SubmitResult				SubmitAction(Ref<RunnerAction> Action) override;
 	[[nodiscard]] virtual bool						IsHealthy() override;
 	[[nodiscard]] virtual size_t					GetSubmittedActionCount() override;
@@ -66,7 +68,9 @@ private:
 	std::string		  m_BaseUrl;
 	HttpClient		  m_Http;
 
-	int32_t m_MaxRunningActions = 256;	// arbitrary limit for testing
+	std::atomic<bool> m_AcceptNewActions{true};
+	int32_t			  m_MaxRunningActions = 256;  // arbitrary limit for testing
+	int32_t			  m_MaxBatchSize	  = 50;
 
 	struct HttpRunningAction
 	{
@@ -92,7 +96,20 @@ private:
 	// creating remote queues. Generated once at construction and never changes.
 	Oid m_InstanceId;
 
+	// WebSocket completion notification client
+	std::unique_ptr<HttpWsClient> m_WsClient;
+	std::atomic<bool>			  m_WsConnected{false};
+
+	// IWsClientHandler
+	void OnWsOpen() override;
+	void OnWsMessage(const WebSocketMessage& Msg) override;
+	void OnWsClose(uint16_t Code, std::string_view Reason) override;
+
 	Oid EnsureRemoteQueue(int QueueId, const CbObject& Metadata, const CbObject& Config);
+
+	std::vector<SubmitResult> SubmitActionBatch(const std::string& SubmitUrl, const std::vector<Ref<RunnerAction>>& Actions);
+	std::vector<SubmitResult> ParseBatchResponse(const HttpClient::Response& Response, const std::vector<Ref<RunnerAction>>& Actions);
+	std::vector<SubmitResult> FallbackToIndividualSubmit(const std::vector<Ref<RunnerAction>>& Actions);
 };
 
 }  // namespace zen::compute