Tiny village harbours should have small or no piers (beach landing)

[barrulus]

Observed

A pop-16 naval hamlet (FMG burg preview, Patrinoli) renders with two full-sized piers jutting into the sea — the same pier treatment a large port gets.

Since v1.0.0, harbourSize: 'small' emits 2–3 piers sized to reach past the waterline (src/wards/harbour.ts). Pier count/size keys off harbourSize alone — population plays no part below the small/large split, so a 16-person fishing hamlet and a 4 000-person town get the same waterfront furniture.

Expected

Pier presence should scale with population, not just harbourSize:

• Tiny settlements (roughly pop < 100–150): no piers at all — a beach landing. A village of 75 pulls its boats onto the sand; local fishing boats, not seafaring vessels. The harbour ward/quay can stay, just without pier structures.
• Small villages (roughly pop 150–1 000): at most one short, narrow jetty.
• Towns and up: current behavior.

Thresholds above are suggestions — tune on renders. Optionally a beach landing could later render hauled-up boat symbols (symbol library), but the core fix is suppressing/shrinking piers at low population.

Pointers

• src/wards/harbour.ts — pier count, width, and the cone-scan length logic (v1.0.0)
• tests/coastal-core.test.ts — pier root/tip regression tests assert piers.length ≥ 2 for ports; that bound needs to become population-aware with this change
• Note: port: true + ocean data is what triggers coastal rendering at all (as of 48db58d); this issue is about what the waterfront looks like once it does

[barrulus]

Also, at the other end of the scale: large cities need actual harbours, not just piers. A major port city should read as built water infrastructure — an enclosed harbour basin / breakwater or mole sheltering the moorings, quay walls along the waterfront, piers inside the protected water — rather than a row of open piers sticking straight into open sea off the beach.

So the full population ladder for the waterfront becomes roughly:

• < ~100–150: beach landing, no structures (boats hauled onto the sand)
• village: one short jetty
• town: piers off a quay (current v1.0.0 look)
• large city / harbourSize: 'large' + high population: proper harbour works — breakwater/mole enclosing a basin, quay walls, piers inside; possibly a harbour mouth aligned with the sea-route bearing