Add a fishing business: buy a boat and hire a crew

[dmccoystephenson]

Summary

Implements the top PLANNING.md goals — "open a fishing business" and "hire workers" — adding a passive-production layer so money has a purpose beyond the $10k goal.

• Player: new persisted hasBoat (bool) and workers (int), added to schemas/player.json and playerJsonReaderWriter with backward-compatible defaults (old saves load fine).
• src/business/business.py: runDailyProduction(player, stats) — each day every worker catches WORKER_FISH_PER_DAY fish for WORKER_DAILY_WAGE in wages. If the player can't cover payroll, the workers they can't pay quit (a broke, over-hired business shrinks instead of going negative). Hooked into TimeService.increaseDay, next to interest.
• Docks: a "Manage Boat & Crew" option (appended, so existing menu numbers/tests are unchanged) to buy a boat ($%d BOAT_PRICE), hire/dismiss workers (capped at MAX_WORKERS), and view the crew's per-day economics.
• Docs: removes the two completed PLANNING.md goals; documents the feature in the README.

Design notes

• A boat is the upfront gate/investment; hiring is free but commits you to daily wages — wages create the ongoing money sink and the "keep cash on hand" tension.
• Production runs on the day rollover, so it stacks with sleeping/time passing like interest does.

Test plan

• python3 -m compileall -q src clean
• SDL_VIDEODRIVER=dummy SDL_AUDIODRIVER=dummy python3 -m pytest — 210 passed
• New tests: business engine (no-boat no-op, catch+wages, under-funded workers quit, all-quit-when-broke); player defaults; hasBoat/workers round-trip + missing-field defaults; increaseDay runs production; docks buy-boat / insufficient-funds / hire / dismiss / the new run option.

Resolves the PLANNING.md "fishing business" + "hire workers" goals.

🤖 Generated with Claude Code

[dmccoystephenson]

Self-review:

• Scope: PASS — one cohesive feature: Player fields + persistence/schema, src/business engine, TimeService day-hook, docks Manage Boat & Crew UI, docs, tests.
• Schema-sync/save-safety: PASS — hasBoat/workers added optional to schemas/player.json and read with .get defaults; round-trip + missing-field tests confirm old saves load unchanged.
• Tests: PASS — 210; business engine incl. the under-funded/all-quit edge cases, day-rollover production, and docks buy/hire/dismiss/insufficient-funds.
• Regression safety: existing docks menu numbers preserved (option appended); default player makes increaseDay a no-op for the business, so prior TimeService tests hold.
• CI: PASS. Money shown via existing int/%.2f conventions; no unseeded-random tests.