feat: reputation contract

[anonfedora]

PR Title

Implement reputation contract admin controls and score clamping

PR Description

Closes #2

Summary

• Implemented initialize to persist the admin key and reject double-initialization.
• Implemented update_score with admin authentication, default score bootstrap (5000 bps), clamped score updates (0..10000), and total_jobs incrementing.
• Implemented slash with admin authentication and fixed 2000 bps penalty (20% of max), clamped at 0.
• Implemented get_score to return stored values or a default ReputationScore (score=5000, total_jobs=0).
• Added internal score clamp helper to enforce bounds for all write paths.

Why

This completes the on-chain reputation contract behavior needed for trust signals and future feature gating while ensuring score safety invariants and admin-only mutation paths.

Test Plan

• Build contract WASM:
  • cargo build -p reputation --target wasm32-unknown-unknown --release
• Verify initialize rejects second call.
• Verify unauthenticated calls to update_score and slash fail.
• Verify update_score starts from default 5000 for unseen (address, role).
• Verify score never exceeds 10000 or drops below 0 for large positive/negative deltas.
• Verify slash always deducts exactly 2000 bps, with floor clamp at 0.

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[soomtochukwu]

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