feat(contracts): resolve issues #745, #744, #746, and #747

[utilityjnr]

Detailed summary of implementations across Soroban smart contracts:

1. Issue [Contract] Implement Batch Minting for Tree-NFT Certificates #745 [Contract] Implement Batch Minting for Tree-NFT Certificates:

   • Added batch_mint to contracts/nft-certificate/src/lib.rs enabling verifiers to mint up to 50 certificates in a single transaction.
   • Enforced batch size limits (max 50, non-empty), input array length equality, pause checks, and individual metadata validation (tree_count > 0, co2_offset_kg > 0).
   • Updated global TOK_COUNT atomically and emitted btch_mnt event. Added corresponding unit tests.
   • Closes [Contract] Implement Batch Minting for Tree-NFT Certificates #745

2. Issue [Contract] Add Emergency Pause Guard for Soroban Carbon Marketplace #744 [Contract] Add Emergency Pause Guard for Soroban Carbon Marketplace:

   • Added global circuit breaker mechanism (DataKey::Paused) in contracts/carbon-marketplace/src/lib.rs.
   • Added pause, unpause, and is_paused functions gated by admin authorization (admin.require_auth()).
   • Guarded state-changing operations (list, buy, cancel, amm_add_liquidity, amm_remove_liquidity, amm_swap_exact_in, order matching) with assert_not_paused checks. Added corresponding unit tests.
   • Closes [Contract] Add Emergency Pause Guard for Soroban Carbon Marketplace #744

3. Issue [Contract] Implement Dynamic Fee Tier System in Carbon Dex Swaps #746 [Contract] Implement Dynamic Fee Tier System in Carbon Dex Swaps:

   • Implemented dynamic trade volume-based fee tier calculation (get_fee_bps) in contracts/carbon-marketplace/src/lib.rs: * Tier 1 (< 10,000 units): 30 bps (0.30%) * Tier 2 (10,000 - 100,000 units): 20 bps (0.20%) * Tier 3 (>= 100,000 units): 10 bps (0.10%)
   • Updated amm_swap_exact_in and amm_get_quote to compute DEX swap output and pool fee tracking dynamically based on trade size. Added corresponding unit tests.
   • Closes [Contract] Implement Dynamic Fee Tier System in Carbon Dex Swaps #746

4. Issue [Contract] Add Slashing Penalty Escalation for Malicious Proof Verifiers #747 [Contract] Add Slashing Penalty Escalation for Malicious Proof Verifiers:

   • Implemented exponential penalty escalation in contracts/verifier-staking/src/lib.rs for repeat offending verifiers.
   • Added OffenseCount tracking (DataKey::OffenseCount), get_offense_count, and slash_escalated function.
   • Calculated penalty multiplier 2^(n-1) where n is the 1-based offense count (capped at 16x), capping effective slash amount at remaining verifier stake.
   • Transferred slashed tokens to the replanting buffer pool and emitted offense escalation events. Added corresponding unit tests.
   • Closes [Contract] Add Slashing Penalty Escalation for Malicious Proof Verifiers #747

Closes #745, #744, #746, #747

Summary

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What Was Implemented

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Implementation Details

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Checklist

• My code follows the atomic commit convention
• Each commit message follows Conventional Commits (feat:, fix:, etc.)
• I have performed a self-review of my code
• My changes build successfully (pnpm build)
• My changes pass linting (pnpm lint)
• I have added/updated relevant documentation
• New components follow the atomic design pattern (atoms → molecules → organisms)
• UI changes are responsive and tested on mobile viewports
• I have added screenshots/recordings for UI changes

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