AOT/runtime: verify the three Worker entrypoints of OpenCode v1.18.30 end-to-end (TUI server worker, OpenTUI parser worker, thread-stream) #10103

Parent: #10107. Closes the unticked acceptance boxes of #8509 ("OpenCode's TUI worker starts, serves requests, reloads, and terminates cleanly"; "parser/diff worker smoke tests").

Facts

1. TUI server worker — packages/opencode/src/cli/cmd/tui.ts:210-214: new Worker(file, { env: Object.fromEntries(...) }) where file = await target() (tui.ts:52-56: define OPENCODE_WORKER_PATH else new URL("../tui/worker.ts", import.meta.url)). Entry packages/opencode/src/cli/tui/worker.ts. Parent talks over Rpc.client<typeof rpc>(worker) (structured-clone messages), client.call("reload") on SIGUSR2 (tui.ts:216-220), client.call("shutdown") + worker.terminate() on stop (tui.ts:224-230). The worker hosts the whole server/session runtime (Effect, sqlite, providers) — i.e. most of the graph executes on the worker thread.
2. OpenTUI tree-sitter worker — @opentui/core/chunk-bun-t2myhmwd.js:8398 new Worker(workerPath) with workerPath from define OTUI_TREE_SITTER_WORKER_PATH else import.meta.resolve("@opentui/core/parser.worker") (:8464). Entry @opentui/core/parser.worker.js (Emscripten loader + grammars, runtime/AOT (refines #8508): Emscripten main+side-module loading (web-tree-sitter + grammars) and wasm-bindgen (photon) for OpenCode v1.18.30 #10102). Inside the worker the code uses node parentPort from node:worker_threads (parser.worker.js:3621, chunk:8203) while the parent uses the Web Worker API: both shapes must interoperate.
3. thread-stream (thread-stream/index.js:72, pino transport) — only on the GitLab login path via fastify; low priority.
   Also: write-file-atomic only reads worker_threads.isMainThread; source-map-support checks isMainThread (Code Mode path).

Scope

• Worker entry discovery for both spellings (define string path; new URL(relative, import.meta.url); import.meta.resolve(pkg-subpath) — compile: build-time defines (--define, Bun.build semantics) and the no-define fallbacks OpenCode relies on (import.meta.resolve, new URL(..., import.meta.url)) #10101), compiled as separate native entries packaged with the binary (per AOT: compile and register Web Worker entry modules used by full-source OpenCode #8509).
• Worker options: env (full copy of process.env), terminate(), error/exit events, postMessage structured clone of the RPC payloads used by packages/opencode/src/cli/tui/worker.ts (plain objects, arrays, strings, Uint8Array), parentPort.on("message") inside the worker.
• Async-context/GC: the worker runs the Effect runtime and sqlite; confirm moving-GC roots and native handles are per-thread safe (ws/pty/sqlite handles created on the worker).
• Signals: SIGUSR2 reload path.

Acceptance

• Native binary TUI boots: worker starts, first RPC round-trip completes, first frame renders.
• kill -USR2 <pid> triggers client.call("reload") without crashing; Ctrl-C shuts down within the 5 s timeout and exits 0.
• Parser worker highlights code in the TUI (with runtime/AOT (refines #8508): Emscripten main+side-module loading (web-tree-sitter + grammars) and wasm-bindgen (photon) for OpenCode v1.18.30 #10102).
• A reduced fixture (parent .ts + worker .ts using new URL("./w.ts", import.meta.url) and a parentPort-style worker) is added to crates/perry/tests and passes on macOS and Linux.