design: add goal rewards that reinforce existing loop

[itsmiso-ai]

Add small rewards for completed goals that deepen the current loop without adding new resources.

Candidate rewards:

• resource trickle
• temporary gather speed
• temporary haul speed
• temporary build speed
• next ambient event has a better outcome
• one-time food discount for recruiting a worker

Avoid permanent stacking bonuses unless capped and very legible.

Acceptance Criteria

• Define a tiny reward catalog.
• Rewards only affect existing systems.
• Temporary rewards expire predictably.
• UI/event log communicates rewards in one short line.
• Tests cover reward application and expiration.

[itsmiso-ai]

Saffron backlog grooming note

Applied by Saffron groomer.

Recommendation: needs-human
Lane: backlog
Confidence: high

Reason: Finalizing reward values, durations, and balance impact requires product/design judgment before implementation.

Summary

Enhancement to add temporary rewards (speed boosts, resource trickle, discounts) for completed goals. Awaiting human sign-off on exact catalog values to ensure balanced gameplay without breaking existing systems.

Likely files / areas

• src/game/rewards/
• src/core/systems/
• src/ui/events/

Acceptance criteria

• Reward catalog defined with explicit values, durations, and caps
• Temporary effects expire predictably without permanent stacking
• UI/event log communicates rewards in one short line
• Tests cover reward application and expiration logic

Validation

• Run game loop integration tests to verify reward expiration and UI logging

Next action

Product owner to specify exact values, durations, and caps for each candidate reward, then update issue with approved catalog for implementation.