Phase 7: BBS API client + all bbs2gh commands (Go port)

.github/copilot-instructions.md

@@ -27,6 +27,7 @@ This is a C# based repository that produces several CLIs that are used by custom
 - `pkg/scriptgen/`: PowerShell script generation (ported from C#)
 - `pkg/github/`: GitHub API client (REST + GraphQL)
 - `pkg/ado/`: Azure DevOps API client
+- `pkg/bbs/`: Bitbucket Server API client
 - `pkg/storage/`: Cloud storage clients (Azure Blob, AWS S3, GitHub-owned multipart)
 - `pkg/archive/`: Archive upload orchestration
 - `pkg/logger/`, `pkg/env/`: Shared Go packages
@@ -43,24 +44,24 @@ This is a C# based repository that produces several CLIs that are used by custom
 
 ## Go Port Sync Requirements
 
-**Current state:** `gei` and `ado2gh` are fully ported to Go. This includes the ADO API client, all ado2gh commands (migrate-repo, generate-script, inventory-report, etc.), and all gei commands. The GitHub API client, shared commands, and cloud storage clients are also ported.
+**Current state:** All three CLIs (`gei`, `ado2gh`, `bbs2gh`) are fully ported to Go. Every command has behavioral parity with the C# version. Any C# behavioral change must be reflected in the Go port.
 
-**When making C# changes, check if the Go port needs updating:**
+**When making C# changes, you MUST make the corresponding Go change:**
 
-| C# Area | Go Equivalent | Sync Required? |
-|----------|--------------|----------------|
-| `src/gei/Commands/` (any command) | `cmd/gei/` | **Yes** — all gei commands are ported |
-| `src/ado2gh/Commands/` (any command) | `cmd/ado2gh/` | **Yes** — all ado2gh commands are ported |
-| `GenerateScriptCommandHandler.cs` (any CLI) | `cmd/{cli}/generate_script.go` + `pkg/scriptgen/generator.go` | **Yes** — scripts must be identical |
-| `src/Octoshift/Services/GithubApi.cs` | `pkg/github/client.go` | **Yes** — API behavior must match |
-| `src/Octoshift/Services/GithubClient.cs` | `pkg/github/client.go` | **Yes** — HTTP/auth behavior must match |
-| `src/Octoshift/Services/AdoApi.cs` | `pkg/ado/client.go` | **Yes** — API behavior must match |
-| Shared commands in `src/Octoshift/Commands/` | `internal/sharedcmd/` | **Yes** — command behavior must match |
-| `src/Octoshift/Services/AzureApi.cs` | `pkg/storage/azure/client.go` | **Yes** — upload behavior must match |
-| `src/Octoshift/Services/AwsApi.cs` | `pkg/storage/aws/client.go` | **Yes** — upload behavior must match |
-| `src/Octoshift/Services/HttpDownloadService.cs` | `pkg/storage/ghowned/client.go` | **Yes** — multipart upload must match |
-| `src/Octoshift/Services/ArchiveUploader.cs` | `pkg/archive/uploader.go` | **Yes** — orchestration must match |
-| BBS API client (`src/Octoshift/Services/BbsApi.cs`) | Not yet ported | No |
-| `bbs2gh` commands | Not yet ported | No |
+| C# Area | Go Equivalent |
+|----------|--------------|
+| `src/gei/Commands/` (any command) | `cmd/gei/` |
+| `src/ado2gh/Commands/` (any command) | `cmd/ado2gh/` |
+| `src/bbs2gh/Commands/` (any command) | `cmd/bbs2gh/` |
+| `GenerateScriptCommandHandler.cs` (any CLI) | `cmd/{cli}/generate_script.go` + `pkg/scriptgen/generator.go` |
+| `src/Octoshift/Services/GithubApi.cs` | `pkg/github/client.go` |
+| `src/Octoshift/Services/GithubClient.cs` | `pkg/github/client.go` |
+| `src/Octoshift/Services/AdoApi.cs` | `pkg/ado/client.go` |
+| `src/Octoshift/Services/BbsApi.cs` | `pkg/bbs/client.go` |
+| Shared commands in `src/Octoshift/Commands/` | `internal/sharedcmd/` |
+| `src/Octoshift/Services/AzureApi.cs` | `pkg/storage/azure/client.go` |
+| `src/Octoshift/Services/AwsApi.cs` | `pkg/storage/aws/client.go` |
+| `src/Octoshift/Services/HttpDownloadService.cs` | `pkg/storage/ghowned/client.go` |
+| `src/Octoshift/Services/ArchiveUploader.cs` | `pkg/archive/uploader.go` |
 
 **Testing:** Run `go test ./...` to verify Go changes. Run `golangci-lint run` to check for lint issues.