Expand agent context API with completed log and calendar view

- Add completed_tasks table to log task completions with title, due date,
  and completion timestamp
- Extend agent context date range: 7 days back to 14 days forward
- Add completed_log to API response (last 50 completed tasks)
- Add day_section field to timeline items (overdue/today/tomorrow/later)
- Add calendar-style view for today's schedule (6am-10pm hourly grid)
- Add tabbed interface for Timeline vs Completed Log in HTML view

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/internal/store/sqlite.go b/internal/store/sqlite.go
index b324e9f..48bcae5 100644
--- a/internal/store/sqlite.go
+++ b/internal/store/sqlite.go
@@ -1141,3 +1141,55 @@ func (s *Store) CheckAgentTrust(name, agentID string) (models.AgentTrustLevel, e
 
 	return models.AgentTrustNew, nil
 }
+
+// Completed tasks log
+
+// SaveCompletedTask logs a completed task
+func (s *Store) SaveCompletedTask(source, sourceID, title string, dueDate *time.Time) error {
+	var dueDateStr sql.NullString
+	if dueDate != nil {
+		dueDateStr = sql.NullString{String: dueDate.Format(time.RFC3339), Valid: true}
+	}
+	_, err := s.db.Exec(`
+		INSERT OR REPLACE INTO completed_tasks (source, source_id, title, due_date, completed_at)
+		VALUES (?, ?, ?, ?, datetime('now', 'localtime'))
+	`, source, sourceID, title, dueDateStr)
+	return err
+}
+
+// GetCompletedTasks retrieves recently completed tasks
+func (s *Store) GetCompletedTasks(limit int) ([]models.CompletedTask, error) {
+	rows, err := s.db.Query(`
+		SELECT id, source, source_id, title, due_date, completed_at
+		FROM completed_tasks
+		ORDER BY completed_at DESC
+		LIMIT ?
+	`, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer func() { _ = rows.Close() }()
+
+	var tasks []models.CompletedTask
+	for rows.Next() {
+		var task models.CompletedTask
+		var dueDate sql.NullString
+		var completedAt string
+
+		if err := rows.Scan(&task.ID, &task.Source, &task.SourceID, &task.Title, &dueDate, &completedAt); err != nil {
+			return nil, err
+		}
+
+		if dueDate.Valid {
+			if t, err := time.Parse(time.RFC3339, dueDate.String); err == nil {
+				task.DueDate = &t
+			}
+		}
+		if t, err := time.Parse("2006-01-02 15:04:05", completedAt); err == nil {
+			task.CompletedAt = t
+		}
+
+		tasks = append(tasks, task)
+	}
+	return tasks, rows.Err()
+}