docs(clew): explain extraction workflow

src/clew/README.md

@@ -1,8 +1,10 @@
 # Clew
 
-Clew prepares Ren'Py game artifacts for Ariadne.
+Clew extracts Ren'Py game files for Ariadne.
 
-Run Clew with Bazel:
+## Usage
+
+Run Clew from the repository root:
 
 ```sh
 bazel run //src/clew -- \
@@ -10,10 +12,45 @@ bazel run //src/clew -- \
   --force
 ```
 
-The first version copies loose `.rpy` files and collects compiled script files.
-It extracts all files from `.rpa` archives.
-Use `--suffix` to limit archive extraction to selected file suffixes.
-It writes output under `output/` at the repository root by default.
-The output root contains `source/`, `work/`, and `logs/`.
+By default, Clew writes to `output/` at the repository root.
+Use `--output-root` to choose another directory.
 
-Use `--force` to replace those Clew-managed directories.
+```sh
+bazel run //src/clew -- \
+  --game-root /path/to/game \
+  --output-root /tmp/clew-output \
+  --force
+```
+
+Use `--suffix` to extract only selected archive paths.
+Repeat the flag for multiple suffixes.
+
+```sh
+bazel run //src/clew -- \
+  --game-root /path/to/game \
+  --suffix rpy \
+  --suffix rpyc \
+  --force
+```
+
+## Output
+
+Clew owns these directories under the output root:
+
+```text
+output/
+  source/   # copied loose and archived `.rpy` source files
+  work/     # extracted archives and copied compiled scripts
+  logs/     # run logs
+```
+
+Without `--force`, Clew refuses to run when one of those directories exists.
+With `--force`, Clew deletes and recreates only those directories.
+
+## Current behavior
+
+Clew copies loose `.rpy` files into `source/`.
+It copies loose `.rpyc` and `.rpymc` files into `work/compiled/`.
+It extracts each `.rpa` archive into `work/archives/`.
+It copies extracted `.rpy` files into `source/`.
+It skips files under Ren'Py runtime directories.