feat(vars): add interactive prompting for required variables (#2579)

website/src/docs/reference/cli.md

@@ -301,6 +301,19 @@ Automatically answer "yes" to all prompts.
 task deploy --yes
 ```
 
+#### `--interactive`
+
+Enable interactive prompts for missing required variables. When a required
+variable is not provided, Task will prompt for input instead of failing.
+
+Task automatically detects non-TTY environments (like CI pipelines) and
+skips prompts. This flag can also be set in `.taskrc.yml` to enable prompts
+by default.
+
+```bash
+task deploy --interactive
+```
+
 ## Exit Codes
 
 Task uses specific exit codes to indicate different types of errors:

website/src/docs/reference/config.md

@@ -135,6 +135,20 @@ concurrency: 4
 failfast: true
 ```
 
+### `interactive`
+
+- **Type**: `boolean`
+- **Default**: `false`
+- **Description**: Prompt for missing required variables instead of failing.
+  When enabled, Task will display an interactive prompt for any missing required
+  variable. Requires a TTY. Task automatically detects non-TTY environments
+  (CI pipelines, etc.) and skips prompts.
+- **CLI equivalent**: [`--interactive`](./cli.md#--interactive)
+
+```yaml
+interactive: true
+```
+
 ## Example Configuration
 
 Here's a complete example of a `.taskrc.yml` file with all available options:

website/src/docs/reference/schema.md

@@ -655,7 +655,7 @@ tasks:
 #### `requires`
 
 - **Type**: `Requires`
-- **Description**: Required variables with optional enums
+- **Description**: Required variables with optional enum validation
 
 ```yaml
 tasks:
@@ -680,6 +680,9 @@ tasks:
       - ./deploy.sh
 ```
 
+See [Prompting for missing variables interactively](/docs/guide#prompting-for-missing-variables-interactively)
+for information on enabling interactive prompts for missing required variables.
+
 #### `watch`
 
 - **Type**: `bool`