docs: document BMC retry transport (#134)

Add the retry-on-transient-failure feature to the README/registry feature
lists and list http_retry.go in the architecture file-structure diagram,
following up on #133.

Author: jfreed-dev

README.md

@@ -46,6 +46,7 @@ A Terraform provider for managing Turing Pi's Baseboard Management Controller (B
 - **Talos Linux Support** - Built-in boot detection for Talos Linux clusters
 - **TLS Flexibility** - Skip certificate verification for self-signed or expired BMC certificates
 - **Environment Variables** - Configure provider via environment variables for CI/CD pipelines
+- **Transient Failure Retry** - BMC API calls automatically retry connection errors and 502/503/504 responses with exponential backoff
 
 See [TODO.md](TODO.md) for planned features, upcoming milestones, and what shipped in each release.
 

docs/ARCHITECTURE.md

@@ -421,6 +421,7 @@ terraform-provider-turingpi/
 │   ├── provider.go                      # Provider schema and config
 │   ├── auth.go                          # Authentication logic
 │   ├── helpers.go                       # Shared API helpers
+│   ├── http_retry.go                    # Retry transport for transient BMC failures
 │   ├── cluster_helpers.go               # Cluster provisioning utilities
 │   ├── ssh_client.go                    # SSH connection management
 │   ├── helm_client.go                   # Helm chart deployment

docs/index.md

@@ -17,6 +17,7 @@ The Turing Pi provider enables Terraform-based management of [Turing Pi 2.5](htt
 - **Node Provisioning** - Combined resource for complete node management
 - **Talos Linux Support** - Built-in support for Talos Linux boot detection
 - **TLS Flexibility** - Skip certificate verification for self-signed or expired BMC certificates
+- **Transient Failure Retry** - BMC API calls automatically retry connection errors and 502/503/504 responses with exponential backoff
 
 ## Example Usage