feat(escrow): validate config bounds and reject unconfigured deposits (Closes #179)

[stayzappy]

Closes #179

Summary of Changes (Closes #179)

1. Config Bounds Validation

• Updated set_config in contracts/lineproof-escrow/src/lib.rs to enforce config.min_deposit <= config.max_deposit (panics with "min_deposit_exceeds_max").
• Enforced config.hold_period_days > 0 (panics with "hold_period_must_be_positive").

2. Explicit Escrow Initialization Guard

• Removed implicit self-admin default fallback in deposit(). Calling deposit() on an uninitialized queue escrow now explicitly panics with "escrow_not_configured".

3. Test Suite

• Added comprehensive unit tests in contracts/lineproof-escrow/src/test.rs covering:
  • set_config validation of min_deposit > max_deposit
  • set_config validation of hold_period_days == 0
  • deposit rejection when escrow is not configured
  • Positive hold period and ledger timestamp advancement for expiration tests.

Verification

• Ran cargo test -p lineproof-escrow: 18 passed, 0 failed.
• Ran all contracts tests in workspace (cargo test): 93 passed, 0 failed.

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