P1: Remove unused injects and functions
- Remove unused appOpenPromptPreview inject from ContextSystemWorkspace
- Remove unused appOpenPromptPreview inject from ContextUserWorkspace
- Remove unused handleOpenToolManager/handleOpenVariableManager from ContextUserWorkspace
P2: Fix saveToGlobal bypassing persistence
- Use variableManager.addVariable() instead of direct customVariables.value assignment
- This ensures proper validation and saveToStorage() is called
P3: Fix trailing whitespace in docs
- Remove trailing whitespace from replicate.md
- Remove trailing whitespace from style-learn.md