feat: add bridge reconciliation demo with migration and replay

[simonovic86]

Overview

Adds a comprehensive bridge reconciliation demonstration that showcases Igor's core capabilities: agent migration, checkpoint recovery, and replay-based verification.

Changes

New Components

• agents/reconciliation/: Reconciliation agent implementation

  • State machine: DetectedPendingTransfer → WaitingConfirmations → ReadyToFinalize → Finalized → Completed
  • Idempotency tracking to prevent duplicate finalize execution
  • Serialization/deserialization for checkpointing
  • Manifest with migration policy enabled

• cmd/demo-reconciliation/: Demo orchestrator

  • Creates two in-process libp2p nodes
  • Loads agent on node-a and runs 9 ticks
  • Injects crash after checkpoint save
  • Migrates agent to node-b
  • Resumes execution and verifies replay determinism
  • Generates human-readable incident timeline

• internal/timeline/: Incident report generator

  • Renders formatted timeline with timestamps and event categorization
  • Safety summary with verification checks
  • Side-by-side comparison: naive worker vs Igor approach

Build Updates

• Added agent-reconciliation and demo targets to root Makefile
• Agent Makefile for tinygo WASM compilation

Key Demo Flow

1. Detection: Agent detects pending cross-chain transfer
2. Confirmation: Accumulates 6 block confirmations
3. Finalization: Records idempotency key, executes finalize side effect
4. Crash: Host failure injected after tick 9
5. Recovery: Agent migrated, checkpoint restored on node-b
6. Verification: Replay engine verifies determinism (>6 ticks)
7. Completion: No duplicate execution despite migration
8. Proof: Timeline proves exactly-once semantics

Testing

• Timeline rendering tests (header, timestamps, crash markers, safety checks)
• Event filtering and log extraction from eventlog history
• Replay verification against stored state hashes

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