[Rhema888]

Summary

Closes #1319
Closes #1320
Closes #1321
Closes #1322

Implements resilient, chain-aware transaction receipt polling with exponential backoff and jitter algorithms for EVM execution within BridgeWise.

Changes

• Backoff & Jitter Engine:
  • Configurable exponential backoff bounded by chain-specific initialIntervalMs and maxIntervalMs.
  • Configurable jitter algorithms: proportional (default, +/- ratio), full (random 0..interval), equal (half deterministic, half random), and decorrelated.
• Chain-Specific Profiles:
  • Tailored polling intervals, timeout windows, and confirmation depths for Ethereum Mainnet (chainId 1), Arbitrum One (chainId 42161), Optimism (chainId 10), Base (chainId 8453), Polygon PoS (chainId 137), and BNB Smart Chain (chainId 56), with generic fallback.
• Untrusted RPC Input Validation:
  • Validates receipt structure, block numbers, block hashes, and execution status (0x1 / 0x0).
  • Terminal revert handling (status === 0) with immediate operator escalation.
• Concurrency & Idempotency:
  • In-flight active poller deduplication prevents concurrent duplicate submissions and conflicting state transitions for the same (chainId, txHash).
• Reorg & Replacement Protection:
  • Detects chain reorgs if block hash changes or receipt disappears during confirmation progression.
  • Supports transaction replacement detection via hash tracking.
• State Machine Integration:
  • Integrates with EvmTransactionLifecycleManager to record transitions from submitted -> mined -> confirmed / reverted / reorg_detected / timed_out.
• Security & Redaction:
  • Automatically scrubs and redacts private keys, secret tokens, bearer headers, mnemonic phrases, and basic auth / query tokens from RPC URLs in logs and telemetry.

Verification Evidence

• 45 unit and integration tests passing with 0 failures covering:
  • Backoff calculation & jitter variance boundaries
  • RPC receipt validation & error handling
  • Confirmation depth progression
  • Concurrent poll deduplication
  • Timeout and operator escalation paths
  • Reorg & replacement detection
  • Secret redaction and telemetry sanitization
  • Lifecycle state machine synchronizations

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