
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
It is known that the function $f(x) = e^{x}(ax+b) - x^{2} - 4x$, and the tangent line of the curve $y=f(x)$ at the point $(0, f(0))$ is $y=4x+4$.  
(Ⅰ) Find the values of $a$ and $b$;  
(Ⅱ) Discuss the monotonicity of $f(x)$ and find the maximum value of $f(x)$.

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