fix: synchronize errors.rs with missing enum variants

[maztah1]

Closes #113 (issue #5 — Define Missing SAC and Oracle Error Codes)

Problem

The contract referenced ErrorCode::AssetClawedBack and ErrorCode::StalePrice that were either missing or the enum exceeded Soroban SDK's 50-variant limit for #[contracterror], causing compilation failures.

Changes

Core Fix

• errors.rs: Consolidated ErrorCode enum to exactly 50 variants (Soroban SDK contracterror limit). StalePrice (31) and AssetClawedBack (32) are now properly defined.

SAC Module

• sac.rs: detect_clawback now correctly returns ErrorCode::AssetClawedBack instead of ErrorCode::InsufficientBalance.

Oracle Module

• oracles.rs: Removed duplicate function bodies, publish_time is now u64, added abs_price_to_u64 helper for safe i64::MIN handling. StalePrice and ConfidenceTooLow propagate correctly through validate_price.

Supporting Fixes

• types.rs: Added UpgradeStats, PendingGuardianRemoval, winner_counts, total_claimed; ConfigKey::UpgradeRejectedAt now uses BytesN<32>
• markets.rs: Added get_outcome_stake/set_outcome_stake helpers, fixed Market struct initialization
• governance.rs: Updated wasm_hash type to BytesN<32>, added set_timelock_duration
• events.rs: Shortened symbol strings to Soroban's 9-char max
• circuit_breaker.rs / fees.rs: Replaced non-existent try_require_auth with correct auth patterns
• resolution.rs: Fixed get_oracle_result call signature mismatch
• All test files: Removed duplicate use statements and struct field initializations

Verification

cargo build --manifest-path contracts/predict-iq/Cargo.toml

Finished dev profile — no errors

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