Module variables 

Purpose: Provide the public template-variable API surface for validation, context detection, and substitution.

Responsibilities:

• Declare the template::variables child modules.
• Re-export the stable public API used by template loading and callers.

Scope:

• Thin facade only; implementation lives in sibling files under template/variables/.

Usage:

• Import public types and helpers through crate::template or crate::template::variables.

Invariants/Assumptions:

• The public API surface remains stable across the split.
• Validation, detection, and substitution behavior lives in focused companions and must remain unchanged.

Structs

TemplateContext

Context for template variable substitution.

TemplateValidation

Result of template validation.

Enums

TemplateWarning

Warning types for template validation.

Functions

detect_context

Detect context from target path and git repository (legacy, ignores warnings).

detect_context_with_warnings

Detect context from target path and git repository.

substitute_variables

Substitute variables in a template string.

substitute_variables_in_task

Substitute variables in all string fields of a Task.

validate_task_template

Validate a template task and collect warnings.