Initial TrueGrowth source import

openspec/changes/add-digital-human-script-batch/specs/digital-human-workflow/spec.md

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+## ADDED Requirements
+
+### Requirement: Digital Human Script List
+
+The system SHALL let users maintain a list of one or more digital human talking-head scripts inside the one-click compose flow before creating videos.
+
+#### Scenario: Add scripts manually
+
+- **WHEN** a user enters a script and clicks add
+- **THEN** the script is appended to the current script list
+- **AND** the user can select, edit, duplicate, or remove scripts before generation
+
+### Requirement: Smart Digital Human Script Generation
+
+The system SHALL provide an intelligent script generation dialog with built-in digital human scenes and controls for count, length, style, and custom prompt guidance.
+
+#### Scenario: Generate scripts from a scene
+
+- **WHEN** a user chooses a scene, target length, style, count, and optional custom prompt
+- **THEN** the system generates the requested number of talking-head scripts
+- **AND** appends the generated scripts to the current script list without discarding existing scripts
+
+### Requirement: Batch Digital Human Creation
+
+The system SHALL create a separate digital human generation task for each selected script while reusing the chosen avatar, voice, model, subtitle, aspect ratio, and background settings.
+
+#### Scenario: Start batch generation
+
+- **WHEN** the user selects multiple scripts and clicks batch create
+- **THEN** one digital human task is created for each selected script
+- **AND** every task payload uses the corresponding script text with the current avatar and voice configuration