
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given an ellipse $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1$ ($a > b > 0$), a line passing through points A($-a, 0$) and B($0, b$) has an inclination angle of $\frac{\pi}{6}$, and the distance from origin to this line is $\frac{\sqrt{3}}{2}$.

(1) Find the equation of the ellipse.
(2) Suppose a line with a positive slope passes through point D($-1, 0$) and intersects the ellipse at points E and F. If $\overrightarrow{ED} = 2\overrightarrow{DF}$, find the equation of line EF.
(3) Is there a real number $k$ such that the line $y = kx + 2$ intersects the ellipse at points P and Q, and the circle with diameter PQ passes through point D($-1, 0$)? If it exists, find the value of $k$; if not, explain why.

Present the answer in LaTex format: \boxed{Your answer}
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