[JamesVictor-O]

Summary

• require an independent guardian and a 48-hour timelock for policy oracle rotations
• enforce a one-hour to 30-day claim dispute window, defaulting to seven days and rejecting zero
• stop LP NFT minting with a typed overflow error when the u64 ID space is exhausted
• identify and reject circular governance delegation before state changes
• document all four security rules and restore the contract entry points replaced by placeholders in upstream main

Verification

• cargo check --lib -p parashield-policy-engine -p parashield-claims-processor -p parashield-risk-pool -p parashield-governance-dao
• cargo test -p parashield-policy-engine --test oracle_rotation (2 passed)
• cargo test -p parashield-claims-processor --test dispute_window (1 passed)
• cargo test -p parashield-governance-dao circular_delegation_is_refused (1 passed)
• cargo test -p parashield-risk-pool lp_nft_id_exhaustion_fails_with_overflow (1 passed)

Upstream baseline note

Upstream main currently replaces four contract lib.rs files with one-line placeholders. This PR restores their immediate-parent implementations so the assigned fixes can compile. The full legacy unit suite also contains pre-existing malformed policy fixtures (missing expected_token / payment-token arguments); focused integration tests are used above and pass.

Closes #677
Closes #678
Closes #679
Closes #680

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