Release v1.0.0: Production-ready SWOOSH with durability guarantees

Major enhancements:
- Added production-grade durability guarantees with fsync operations
- Implemented BadgerDB WAL for crash recovery and persistence
- Added comprehensive HTTP API (GET/POST /state, POST /command)
- Exported ComputeStateHash for external use in genesis initialization
- Enhanced snapshot system with atomic write-fsync-rename sequence
- Added API integration documentation and durability guarantees docs

New files:
- api.go: HTTP server implementation with state and command endpoints
- api_test.go: Comprehensive API test suite
- badger_wal.go: BadgerDB-based write-ahead log
- cmd/swoosh/main.go: CLI entry point with API server
- API_INTEGRATION.md: API usage and integration guide
- DURABILITY.md: Durability guarantees and recovery procedures
- CHANGELOG.md: Version history and changes
- RELEASE_NOTES.md: Release notes for v1.0.0

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

reducer.go

@@ -614,7 +614,9 @@ func joinRationale(r []string) string {
 	return strings.Join(r, "; ")
 }
 
-func computeStateHash(state OrchestratorState) (string, error) {
+// ComputeStateHash calculates the SHA256 hash of the canonical JSON representation.
+// This is exported for use by main.go during genesis state initialization.
+func ComputeStateHash(state OrchestratorState) (string, error) {
 	payload, err := canonicalJSON(state)
 	if err != nil {
 		return "", err
@@ -624,6 +626,11 @@ func computeStateHash(state OrchestratorState) (string, error) {
 	return hex.EncodeToString(sum[:]), nil
 }
 
+// computeStateHash is the internal wrapper (for backwards compatibility)
+func computeStateHash(state OrchestratorState) (string, error) {
+	return ComputeStateHash(state)
+}
+
 func canonicalJSON(value any) ([]byte, error) {
 	buf, err := json.Marshal(value)
 	if err != nil {