v1.0.0-alpha.6

Changes since alpha.5

Critical: Syncing now works

• syncHeaders() was never called — the SPV client started the peer manager but never triggered header synchronization when peers connected
• Added onPeerReady callback to PeerManager that notifies the SPV client when a peer completes the version/verack handshake
• SPV client now automatically starts header sync on first ready peer
• Bloom filter is sent to each newly connected peer
• isSyncing state is driven by actual sync progress events, not set prematurely

Code quality

• Full codebase audit (40+ source files)
• Updated README with current architecture
• Gradle 8.13 pinned via Expo config plugin (avoids Gradle 9 IBM_SEMERU bug)
• GitHub Actions updated to use Java 21

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APK and desktop builds attached when CI completes.