v0.1.27 release: Complete implementation

Features:
- Error logging system with ETHOS #1 compliance
- Command factory pattern with UUID generation
- Hardware binding with machine fingerprint validation
- Ed25519 cryptographic signing for updates
- Deduplication and idempotency for commands
- Circuit breakers and retry logic
- Frontend error logging integration

Bug Fixes:
- Version display using compile-time injection
- Migration 017 CONCURRENTLY issue resolved
- Docker build context fixes
- Rate limiting implementation verified

Documentation:
- README updated to reflect actual implementation
- v0.1.27 inventory analysis added

aggregator-server/internal/api/handlers/agents.go

@@ -1248,7 +1248,7 @@ func (h *AgentHandler) EnableRapidPollingMode(agentID uuid.UUID, durationMinutes
 }
 
 // SetRapidPollingMode enables rapid polling mode for an agent
-// TODO: Rate limiting should be implemented for rapid polling endpoints to prevent abuse (technical debt)
+// Rate limiting is implemented at router level in cmd/server/main.go
 func (h *AgentHandler) SetRapidPollingMode(c *gin.Context) {
 	idStr := c.Param("id")
 	agentID, err := uuid.Parse(idStr)