Add archive helpers and harden task runtime

site/doc/pages/3_C++ Preprocessor.txt

@@ -25,7 +25,7 @@ The template rewriting implementation lives in `src/lib/compiler-parser.cpp`, wi
 - Inside a literal block, `<?= expression ?>` emits `print(html_escape(expression));`.
 - Inside a literal block, `<?: expression ?>` emits `print(expression);` without HTML escaping.
 - `#load "other.uce"` injects another UCE unit at compile time.
-- `RENDER(Request& context)`, `COMPONENT(Request& context)`, `ONCE(Request& context)`, `INIT(Request& context)`, and `WS(Request& context)` are normal C++ macros from `src/lib/compiler.h`.
+- `RENDER(Request& context)`, `COMPONENT(Request& context)`, `CLI(Request& context)`, `ONCE(Request& context)`, `INIT(Request& context)`, and `WS(Request& context)` are normal C++ macros from `src/lib/compiler.h`.
 - `COMPONENT:NAME(Request& context)` is rewritten by the custom pass into an exported named component handler.
 - `EXPORT` is also a normal C++ macro, but the custom pass additionally records exported declarations for metadata.
 
@@ -47,7 +47,7 @@ The template rewriting implementation lives in `src/lib/compiler-parser.cpp`, wi
 - The final generated source is written to `BIN_DIRECTORY + src_path + "/" + source_file + ".cpp"`.
 - `scripts/compile` then compiles that generated `.cpp` into `source_file + ".so"` with `clang++ -shared -std=c++20 ...`.
 - When a worker loads the compiled unit into memory, the runtime checks for `INIT(Request& context)` and calls it once for that worker-side load.
-- On each request, the first time a given unit is entered through `RENDER()` or any `COMPONENT...` handler, the runtime checks for `ONCE(Request& context)` and calls it before the render/component handler.
+- On each request, the first time a given unit is entered through `RENDER()`, `CLI()`, or any `COMPONENT...` handler, the runtime checks for `ONCE(Request& context)` and calls it before the selected handler.
 
 ## Generated Files