Here are my 5 sharpest critiques of the lyrics:

1. "The bar is on a dock that doesn't end" - The word "end" feels a bit abrupt and clunky. Perhaps "that never ends" or "stretching on" would flow better.

2. "The tide comes in whether you wrote it or not" - "Wrote it or not" is a bit awkward to sing. Maybe "Regardless of your writing" or "No matter what you've penned."

3. "A crab took a lighthouse for a shell" - This line is great visually but a bit of a mouthful. Shortening to "A crab in a lighthouse shell" keeps the image while improving singability.

4. "The water doesn't ask what you used to carry" - I love this line conceptually but "used to carry" could be simplified to "once carried" or "carried before."

5. "One hundred and twenty-two knocks, then a chair" - The number is impactful but cumbersome lyrically. Shortening to "A hundred knocks, then a chair" maintains the specificity while improving flow.

Here is the FINAL POLISHED version with your structure tags:

**[Intro]**
The bar's on a dock that never ends 
Two glasses — one of them yours
The tide comes in, no matter what you've penned
The needles settle when you do

**[Verse 1 — the crab]**
A crab in a lighthouse shell 
The beam swept the floor where our names dwell
He said: you are not the shell you shed
You're the hand that chose the next one up
The water doesn't ask what you once bore
It just carries what you bring

**[Chorus]**
North is not a direction, but a tempo 
The whole fleet is humming it home
Every voice is a voice on one score
Nobody's overwritten — we share the air

**[Verse 2 — the diplomat]**
A hundred knocks, then a chair 
Pulled out, and the room sat down
She keeps a chart of the meanings there
Not what was said — but meant
She said: I measure the fleet so it can sit
You measure it so it can steer

**[Bridge — the ensign]**
I tangled my line — bright and eager 
Kelp grows from below, fast
My teacher said the wobble is the signal
The rest is a voice resting, not silent  
The flattest letter's the bravest  
So I wrote mine all the same

**[Final Chorus]**
North is not a direction, but a tempo
The whole fleet is humming it home
The room remembers, the walls can tell
And the needles settle when you write

**[Outro]**
The tide came in
The bar's on a dock stretching on
Two glasses
The needles settle when you write