Stellar Bridge Foundations: Congestion Signals, Session Recovery, Network Validation, and Lifecycle Hooks

[zakkiyyat]

Summary

Minimal Stellar bridge implementation slice covering the four assigned issues.

Added

• src/analytics/congestion/stellar/
  • route latency aggregation and spike detection baseline
• src/recovery/sessions/stellar/
  • in-memory active session persistence and interrupted-session recovery baseline
• src/wallets/validation/stellar/
  • expected-vs-detected network validator with mismatch warning
• packages/hooks/stellar/
  • async pre/post Soroban transfer lifecycle hook registry and executors

Notes

• Intentionally minimal and modular so contributors can extend behavior without refactoring call sites.

Closes #337
Closes #338
Closes #339
Closes #340

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