[MrWestWiz]

closes #230
closes #231
closes #232
closes #233
Add comprehensive fuzz targets for high-risk contract surfaces:

Markets Contract:

• place_bet.rs: Exercises bet placement with arbitrary stakes, market states, outcome validation, and pool accumulation. Detects overflow and state transition violations.
• claim_winnings.rs: Tests payout claims with CEI pattern protection, double-claim prevention, and payout calculation correctness.

Fees Contract:

• collect_fees.rs: Fuzzes fee collection with admin enforcement, cooldown periods, collection thresholds, and pause/unpause state transitions.

Implementation Details:

• All targets follow established fuzz patterns from existing targets (disputes, oracles, resolution, predictify-hybrid)
• Fixed-byte-consumption model for deterministic action sequencing
• Error codes frozen against auth_boundary tests to prevent regression
• CEI pattern validation ensures reentrant call safety
• Pre-allocated resource pools (4 markets, 5 users) for efficient coverage

Risk Coverage:

• Markets handles highest funds volume (now covered)
• Fees collects platform revenue (now covered)
• Reduces uncovered high-risk surface from 3 to 1 contract

Running:
cargo +nightly fuzz run --fuzz-dir contracts/markets/fuzz place_bet cargo +nightly fuzz run --fuzz-dir contracts/markets/fuzz claim_winnings cargo +nightly fuzz run --fuzz-dir contracts/fees/fuzz collect_fees

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