feat(engine): rename facade to oakengine, build liboakengine.dylib

- src/facade/rust -> src/engine/rust; package oakfacade -> oakengine
- crate-type += cdylib; module crates are real deps; linkage anchors
  force-link module C ABIs into the dylib
- build.rs: -undefined dynamic_lookup for host-provided oakcore_*/fb_*
- nm: 749 oakengine_* + 687 module oak*_* exports; undefined set is
  only the intended host-provided symbols
- worker/cli updated to the new path/name; undo test race fix

worker/rust/src/main.rs

@@ -19,7 +19,7 @@
 //! A thin shell over the facade, mirroring `worker/workermain.cpp`: all
 //! runtime logic — render backend selection (dynamic -> OpenGL fallback
 //! through the oakrender module C ABI), the startup handshake and the
-//! NDJSON control loop — lives in `oakfacade::worker` (the Rust port of
+//! NDJSON control loop — lives in `oakengine::worker` (the Rust port of
 //! `engine/src/capi/worker.cpp`, contract in
 //! `engine/include/oakengine/worker.h`). This crate keeps only the CLI
 //! surface (arg parsing) and the in-process session mirror
@@ -37,7 +37,7 @@ use std::process::exit;
 use clap::Parser;
 
 // Force-link the oakrender module crate: the facade's worker module
-// (oakfacade::worker) initializes the render backend through the oakrender
+// (oakengine::worker) initializes the render backend through the oakrender
 // C ABI, but its bridge imports are `extern "C"` declarations — nothing in
 // the worker source names the crate, so without this the oakrender rlib
 // would not be added to the link and those imports would stay undefined.
@@ -46,7 +46,7 @@ use oakrender as _;
 
 /// Protocol version announced in the startup handshake
 /// (`k_protocol_version` in worker.cpp). Mirrors
-/// `oakfacade::worker::PROTOCOL_VERSION`.
+/// `oakengine::worker::PROTOCOL_VERSION`.
 pub const PROTOCOL_VERSION: i32 = 1;
 
 /// CLI surface (the C++ worker scans argv for `--backend`; clap formalizes
@@ -68,7 +68,7 @@ fn main() {
     let args = Args::parse();
     // The facade's worker_main is the C++ oakengine_worker_main() — the
     // whole worker flow. Like workermain.cpp, this main only forwards.
-    exit(oakfacade::worker::worker_main(&args.backend.to_ascii_lowercase()));
+    exit(oakengine::worker::worker_main(&args.backend.to_ascii_lowercase()));
 }
 
 /// Log a worker-side message to stderr, mirroring worker.cpp `log_error()`

worker/rust/src/session.rs

@@ -16,7 +16,7 @@
 
 //! The worker-side session state machine — the in-process mirror of
 //! `OakWorkerSession` in `engine/src/capi/worker.cpp` (whose production
-//! Rust port lives in `oakfacade::worker`).
+//! Rust port lives in `oakengine::worker`).
 //!
 //! The session holds the attached shared-memory frame-slot pools
 //! ([`crate::transport::AttachedPools`]) and the shutdown flag, and
@@ -61,7 +61,7 @@ impl WorkerSession {
 	}
 
 	/// The attached output pool (the worker->main frame-slot pool).
-	pub fn output_pool(&self) -> Option<&oakfacade::ipc::FrameSlotPool> {
+	pub fn output_pool(&self) -> Option<&oakengine::ipc::FrameSlotPool> {
 		self.pools.as_ref().map(|p| &p.output_pool)
 	}
 
@@ -196,7 +196,7 @@ impl Default for WorkerSession {
 #[cfg(test)]
 mod tests {
 	use super::*;
-	use oakfacade::ipc::{FrameSlotPool, SharedMemoryRegion, ShmMode};
+	use oakengine::ipc::{FrameSlotPool, SharedMemoryRegion, ShmMode};
 	use serde_json::json;
 
 	/// A unique, temporary POSIX segment key for a test.

worker/rust/src/transport.rs

@@ -20,7 +20,7 @@
 //! shared-memory segments holding an `olive::ipc::FrameSlotPool` — a fixed
 //! pool of frame slots whose free/ready queues are synchronized by the
 //! lock-free single-producer/single-consumer `SpscRingBuffer`. That
-//! machinery is implemented in the facade crate (`oakfacade::ipc`, the
+//! machinery is implemented in the facade crate (`oakengine::ipc`, the
 //! Rust port of `engine/render/ipc/` behind
 //! `engine/include/oakengine/ipc.h`) — this module is the worker-side
 //! transport over it.
@@ -36,7 +36,7 @@
 //! as before: `oaknode` is a `todo!()` skeleton and the oakrender crate
 //! does not yet evaluate an arbitrary loaded graph to a frame.
 
-use oakfacade::ipc::{FrameSlotPool, SharedMemoryRegion, ShmMode};
+use oakengine::ipc::{FrameSlotPool, SharedMemoryRegion, ShmMode};
 
 use crate::ipc::HandshakeMsg;