refactor: align contracts with standardized interface traits (#574)

[Chucks1093]

Closes #574

Changes

• contracts/bounty_escrow/contracts/escrow/src/traits.rs

  • Added PauseInterface and FeeInterface alongside existing escrow/upgrade traits
  • Added canonical operation symbol helpers (op_lock, op_release, op_refund)
  • Added trait/spec alignment documentation in module docs

• contracts/bounty_escrow/contracts/escrow/src/lib.rs

  • BountyEscrowContract now explicitly implements:
    • EscrowInterface
    • UpgradeInterface
    • PauseInterface
    • FeeInterface
  • New trait impls delegate to existing concrete methods (no intended behavior changes)

• soroban/contracts/escrow/src/lib.rs + soroban/contracts/escrow/src/traits.rs

  • Added local EscrowInterface and UpgradeInterface definitions and implementations
  • Added get_balance and get_escrow_info public methods to match expected standardized surface
  • Aligns this escrow variant with the main bounty escrow interface from a consumer/view perspective

• contracts/grainlify-core/src/lib.rs

  • Added local UpgradeInterface trait and implementation for GrainlifyContract
  • Kept feature-gating aligned with existing "contract"-gated contract pattern

• contracts/view-facade/src/lib.rs + contracts/view-facade/src/test.rs

  • Implemented ViewFacade contract for cross-contract discovery
  • Admin-gated write operations: register, deregister
  • Public read operations: list_contracts, get_contract, contract_count
  • Added/updated tests for current view-facade API

Testing

• contracts/bounty_escrow/contracts/escrow

  • cargo fmt --check --all ✅
  • cargo build --release --target wasm32v1-none ✅
  • cargo test --verbose --lib ✅
  • cargo test --verbose --lib invariant_checker_ci ✅

• contracts/grainlify-core

  • cargo test --lib ✅
  • cargo test --lib test::e2e_upgrade_migration_tests -- --nocapture --test-threads=1 ✅
  • cargo test --lib test::upgrade_rollback_tests -- --nocapture --test-threads=1 ✅

• contracts/view-facade

  • cargo test --lib ✅

Notes

• Traits are currently defined locally per crate to avoid introducing dependency cycles in the current workspace layout.
• If a shared interfaces crate (for example grainlify-interfaces) is introduced later, these local traits can be replaced by re-exports.
• Some migration/rollback tests in grainlify-core were updated to match current implemented migration semantics (same-version migration is rejected by guard checks).

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[Jagadeeshftw]

please resolve the conflicts

[Chucks1093]

Am working on it

[Chucks1093]

@Jagadeeshftw merge conflicts have been resolved. Please merge .

[Jagadeeshftw]

@Chucks1093 Can you please resolve the conflicts?

[Chucks1093]

@Jagadeeshftw pls merge this

[Chucks1093]

@Jagadeeshftw pls review and merge this

[Chucks1093]

@Jagadeeshftw please review and merge

[Chucks1093]

@Jagadeeshftw