v0.3.3 — Security Hardening & Validation

What's Changed

Security & Validation Fixes

• TLS peer verification enabled by default on all facilitator HTTP connections (#32)
• HTTPS enforcement on facilitator base_url — prevents plaintext credential leakage (#35)
• 8KB payload size cap on PaymentRequired and PaymentResponse (#34)
• PAYMENT-SIGNATURE header size cap to prevent oversized header attacks (#32)
• SIWX ETS size cap to bound memory usage (#39)
• Payment signature format validation tightened (#39)
• Solana address validation strengthened with proper Base58 checks (#36)
• Idempotency cache warning when cache is missing (#36)

Improvements

• Optimized decimal parsing and centralized utility functions (#37)
• Bumped minimum Elixir to ~> 1.19 (#33)

Testing

• Added unit test for HTTP.secure_pool_opts/0 (#38)

Full Changelog: v0.3.2...v0.3.3