Add template expansion to interactive prompts

Apply {{today}} and other template variables to user input in:
- Interactive mode (single and multiline)
- Accumulative mode requirements

crates/g3-cli/src/accumulative.rs

@@ -17,6 +17,7 @@ use crate::simple_output::SimpleOutput;
 use crate::ui_writer_impl::ConsoleUiWriter;
 use g3_core::ui_writer::UiWriter;
 use crate::utils::load_config_with_cli_overrides;
+use crate::template::process_template;
 
 /// Run accumulative autonomous mode - accumulates requirements from user input
 /// and runs autonomous mode after each input.
@@ -75,7 +76,8 @@ pub async fn run_accumulative_mode(
         let readline = rl.readline("requirement> ");
         match readline {
             Ok(line) => {
-                let input = line.trim().to_string();
+                // Apply template expansion (e.g., {{today}} -> 2026-01-26 (Monday))
+                let input = process_template(line.trim());
 
                 if input.is_empty() {
                     continue;

crates/g3-cli/src/interactive.rs

@@ -17,6 +17,7 @@ use crate::g3_status::{G3Status, Status};
 use crate::project::Project;
 use crate::project_files::extract_readme_heading;
 use crate::simple_output::SimpleOutput;
+use crate::template::process_template;
 use crate::task_execution::execute_task_with_retry;
 use crate::utils::display_context_progress;
 
@@ -209,10 +210,11 @@ pub async fn run_interactive<W: UiWriter>(
                         break;
                     }
 
-                    // Process the multiline input
+                    // Process the multiline input (with template expansion)
+                    let processed_input = process_template(&input);
                     execute_task_with_retry(
                         &mut agent,
-                        &input,
+                        &processed_input,
                         show_prompt,
                         show_code,
                         &output,
@@ -248,10 +250,11 @@ pub async fn run_interactive<W: UiWriter>(
                         }
                     }
 
-                    // Process the single line input
+                    // Process the single line input (with template expansion)
+                    let processed_input = process_template(&input);
                     execute_task_with_retry(
                         &mut agent,
-                        &input,
+                        &processed_input,
                         show_prompt,
                         show_code,
                         &output,