Make the fleet passive and put the player at the helm

[dmccoystephenson]

Summary

The fleet becomes the background economy, and captaining a boat yourself becomes the game. Two halves, landed together because either alone leaves the game worse: passive-only removes the interactive content, and voyages-only would pay twice for the same day.

The fleet runs itself

Every role earns each morning now, not just fishing — hauling and transport bring in money, piracy brings in the most plus seized fish. A bad day of piracy damages the hull and, rarely, costs a villager.

That last part needed a way to tell the player, so increaseDay now returns an overnight report surfaced everywhere a day passes (sleeping, a night at the tavern, an export run, a voyage). Losing someone you hired by name should never be something you only notice because the roster got shorter.

Taking the helm — src/business/adventures.py

Take the Helm at the docks. Pick a boat, pick how far out (short run / middle grounds / far water — longer, richer, less forgiving), provision her, then sail her a leg at a time. Each leg is a day at sea and puts a situation in front of you:

LEG 3 of 7   Hull 74%   Supplies 12   Crew 4

A squall builds to the north and the light goes the colour of a bruise.

 [1] Run before it
 [2] Hug the coast and lose a day
 [3] Iris Dunmore reads the sky for a gap
 [4] Ride it out at anchor

That third option exists only because Iris Dunmore is aboard. Choices are gated on the specialties of the villagers you actually brought — Cormac Ide finds the seam in a leaking hull, Junia Marsh goes over the side after what sank, Bastian Roe nurses a sick crew through the night, Sena Vale works out where a merchantman will anchor so you take her asleep. Crewing a boat stops being a headcount and becomes casting, which is what makes the villager roster pay off.

Hull, supplies and crew only ever get scarcer unless a decision is spent on them, and the hold is only yours if you get home. If the hull gives out or the crew starve the voyage is cut short — everything aboard is lost and she comes back a wreck, but the boat is still yours, so a bad run is a setback rather than a save-wrecker. A boat at sea earns nothing at home; that's what taking the helm costs.

Nine events across four role-filtered pools, with the shared ones (squall, wreckage, a leak, sickness, becalmed) reachable by any role and the rest specific — a fishing voyage never meets a patrol cutter, and a raid never frets about its passengers.

Removals

src/business/voyages.py is deleted. The one-shot job runs it added this morning are superseded by captained voyages, and keeping them alongside passive income would have paid twice for the same day. totalRaids / totalPlunder now count days of passive piracy, so the counts already in live saves stay meaningful instead of being stranded.

Test plan

• python3 -m compileall -q src tests
• SDL_VIDEODRIVER=dummy SDL_AUDIODRIVER=dummy python3 -m pytest --verbose -vv --cov=src --cov-report=term-missing --cov-report=xml:cov.xml — 606 passed, 96% total; adventures.py and boats.py both 97%.
• Ran the full suite five times over to confirm the flakiness below is gone.
• black + autoflake over the changed files only.
• Front-end parity. Everything goes through showOptions / showDialogue / currentPrompt — no new primitive, so console, pygame and web all get voyages.
• Played a full voyage through the real console front-end, which is how both problems below were found.

Two things playing it caught

• "Full stores" was a lie. One event (heaving to for the sick) ate crew × 2 supplies, which on a short voyage is half a full load — so a fully-provisioned 4-leg run starved on leg 3. Halved that cost, and added a deep stores option so insuring against a bad week is a decision the player gets to make rather than a trap.
• Two tests were flaky, about 1 run in 6. They asserted a voyage always advances the day by its full leg count. It doesn't — a foundering voyage correctly ends early. Fixed to assert what's actually invariant, and added a deliberate test that a voyage which founders ends early and still comes home.

Balance note

A captained leg is worth several times what the same boat earns passively in a day, which is the point — but the numbers are first-pass. ROLE_LEG_VALUE, VOYAGE_PLANS' multipliers and ROLE_DAILY_PER_CREW are each a single table if it plays too hot or too cold.