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Rework of the Horde agent subsystem from synchronous per-thread I/O to an async ASIO-driven architecture, plus provisioner scale-down with graceful draining, OIDC authentication, scheduler improvements, and dashboard UI for provisioner control.
### Async Horde Agent Rewrite
- Replace synchronous `HordeAgent` (one thread per agent, blocking I/O) with `AsyncHordeAgent` — an ASIO state machine running on a shared `io_context` thread pool
- Replace `TcpComputeTransport`/`AesComputeTransport` with `AsyncTcpComputeTransport`/`AsyncAesComputeTransport`
- Replace `AgentMessageChannel` with `AsyncAgentMessageChannel` using frame queuing and ASIO timers
- Delete `ComputeBuffer` and `ComputeChannel` ring-buffer classes (no longer needed)
### Provisioner Drain / Scale-Down
- `HordeProvisioner` can now drain agents when target core count is lowered: queries each agent's `/compute/session/status` for workload, selects candidates by largest-fit/lowest-workload, and sends `/compute/session/drain`
- Configurable `--horde-drain-grace-period` (default 300s) before force-kill
- Implement `IProvisionerStateProvider` interface to expose provisioner state to the orchestrator HTTP layer
- Forward `--coordinator-session`, `--provision-clean`, and `--provision-tracehost` through both Horde and Nomad provisioners to spawned workers
### OIDC Authentication
- `HordeClient` accepts an `AccessTokenProvider` (refreshable token function) as alternative to static `--horde-token`
- Wire up `OidcToken.exe` auto-discovery via `httpclientauth::CreateFromOidcTokenExecutable` with `--HordeUrl` mode
- New `--horde-oidctoken-exe-path` CLI option for explicit path override
### Orchestrator & Scheduler
- Orchestrator generates a session ID at startup; workers include `coordinator_session` in announcements so the orchestrator can reject stale-session workers
- New `Rejected` action state — when a remote runner declines at capacity, the action is rescheduled without retry count increment
- Reduce scheduler lock contention: snapshot pending actions under shared lock, sort/trim outside the lock
- Parallelize remote action submission across runners via `WorkerThreadPool` with slow-submit warnings
- New action field `FailureReason` populated by all runner types (exit codes, sandbox failures, exceptions)
- New endpoints: `session/drain`, `session/status`, `session/sunset`, `provisioner/status`, `provisioner/target`
### Remote Execution
- Eager-attach mode for `RemoteHttpRunner` — bundles all attachments upfront in a `CbPackage` for single-roundtrip submits
- Track in-flight submissions to prevent over-queuing
- Show remote runner hostname in `GetDisplayName()`
- `--announce-url` to override the endpoint announced to the coordinator (e.g. relay-visible address)
### Frontend Dashboard
- Delete standalone `compute.html` (925 lines) and `orchestrator.html` (669 lines), consolidated into JS page modules
- Add provisioner panel to orchestrator dashboard: target/active/estimated core counts, draining agent count
- Editable target-cores input with debounced POST to `/orch/provisioner/target`
- Per-agent provisioning status badges (active / draining / deallocated) in the agents table
- Active vs total CPU counts in agents summary row
### CLI
- New `zen compute record-start` / `record-stop` subcommands
- `zen exec` progress bar with submit and completion phases, atomic work counters, `--progress` mode (Pretty/Plain/Quiet)
### Other
- `DataDir` supports environment variable expansion
- Worker manifest validation checks for `worker.zcb` marker to detect incomplete cached directories
- Linux/Mac runners `nice(5)` child processes to avoid starving the main server
- `ComputeService::SetShutdownCallback` wired to `RequestExit` via `session/sunset`
- Curl HTTP client logs effective URL on failure
- `MachineInfo` carries `Pool` and `Mode` from Horde response
- Horde bundle creation includes `.pdb` on Windows
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### 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
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- Added local process runners for Linux/Wine, Mac with some sandboxing support
- Horde & Nomad provisioning for development and testing
- Client session queues with lifecycle management (active/draining/cancelled), automatic retry with configurable limits, and manual reschedule API
- Improved web UI for orchestrator, compute, and hub dashboards with WebSocket push updates
- Some security hardening
- Improved scalability and `zen exec` command
Still experimental - compute support is disabled by default
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