Update README

README.md

@@ -89,7 +89,11 @@ Rules:
 When `cleanup` is enabled, the following are removed from the output:
 
 - Spaces before commas
+- Multiple consecutive spaces
+- Empty or comma-only parentheses and brackets
+- Residual commas after opening or before closing parentheses
 - Double or empty commas
+- Leading commas
 - Empty lines
 
 #### Validation
@@ -133,6 +137,43 @@ kneeling
 The empty line above produces a `--` entry in the dropdown, which outputs
 an empty string. If the field is empty, the dropdown resets to `--`.
 
+#### Cartesian product blocks
+
+Use `@combine / --- / @end` blocks to generate all combinations of multiple lists:
+
+```
+@combine
+from front
+straight-on
+from side
+---
+from above
+from below
+---
+close-up
+full body
+@end
+```
+
+Each `---` separates a new list. The block expands into all combinations joined by `, `:
+
+```
+from front, from above, close-up
+from front, from above, full body
+from front, from below, close-up
+...
+```
+
+Multiple `@combine` blocks are allowed and processed independently. A `---` outside a block is treated as a literal option.
+
+#### Validation
+
+The node stops the workflow on error if:
+- `options` is empty
+- A `@combine` block is opened inside another
+- A `@end` is found without a matching `@combine`
+- A `@combine` block is never closed
+
 ---
 
 ### PromptLayoutFiller
@@ -144,6 +185,7 @@ an empty string. If the field is empty, the dropdown resets to `--`.
 - `template` (str) — multiline text with placeholders. Supports `{N}` or
   `{N:label}` syntax where `N` is the slot index (0-based) and `label` is
   a purely visual annotation.
+- `cleanup` (bool), default `True`
 - `slot_0` to `slot_9` (str, connectable) — values injected into the
   corresponding placeholders. Slots are revealed one by one as the previous
   one is connected. Up to 10 slots supported.
@@ -163,6 +205,10 @@ character, {0:position}, {1:background}, {2:lighting}
 Connect a node (e.g. a `PromptOptionPicker`) to each slot. The placeholder
 is replaced by the connected value at execution.
 
+#### Cleanup
+
+Same rules as `PromptPresetSelector`. Useful when a connected slot outputs an empty string, leaving residual commas or parentheses.
+
 #### Validation
 
 The node stops the workflow on error if:
@@ -190,6 +236,7 @@ Slot lengths do not need to match.
 Some text widgets are replaced by a `contentEditable` div that provides syntax highlighting.
 Supported widgets and nodes:
 - `text` widget in `PromptPresetSelector`
+- `options` widget in `PromptOptionPicker`
 - `template` widget in `PromptLayoutFiller`
 
 Colors update in real time while editing or changing other widget's values and pasting always inserts plain text, stripping any HTML formatting.
@@ -199,6 +246,9 @@ Colors update in real time while editing or changing other widget's values and p
 - **Gray**: inactive presets
 - **Blue**: `$N` references on the active preset
 
+`PromptLayoutFiller`:
+- **Orange**: `@combine / --- / @end` tags
+
 `PromptLayoutFiller`:
 
 Placeholders are highlighted in the editor: