feat(orchestrator): CI platform providers — Remote PowerShell, GitHub Actions, GitLab CI, Ansible

Add four new providers that delegate builds to external CI platforms:
- remote-powershell: Execute on remote machines via WinRM/SSH
- github-actions: Dispatch workflow_dispatch on target repository
- gitlab-ci: Trigger pipeline via GitLab API
- ansible: Run playbooks against managed inventory

Each follows the CI-as-a-provider pattern: trigger remote job,
pass build parameters, stream logs, report status.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/model/build-parameters.ts

@@ -107,6 +107,29 @@ class BuildParameters {
   public unityHubVersionOnMac!: string;
   public dockerWorkspacePath!: string;
 
+  // Remote PowerShell provider
+  public remotePowershellHost!: string;
+  public remotePowershellCredential!: string;
+  public remotePowershellTransport!: string;
+
+  // GitHub Actions provider
+  public githubActionsRepo!: string;
+  public githubActionsWorkflow!: string;
+  public githubActionsToken!: string;
+  public githubActionsRef!: string;
+
+  // GitLab CI provider
+  public gitlabProjectId!: string;
+  public gitlabTriggerToken!: string;
+  public gitlabApiUrl!: string;
+  public gitlabRef!: string;
+
+  // Ansible provider
+  public ansibleInventory!: string;
+  public ansiblePlaybook!: string;
+  public ansibleExtraVars!: string;
+  public ansibleVaultPassword!: string;
+
   public static shouldUseRetainedWorkspaceMode(buildParameters: BuildParameters) {
     return buildParameters.maxRetainedWorkspaces > 0 && Orchestrator.lockedWorkspace !== ``;
   }
@@ -242,6 +265,29 @@ class BuildParameters {
       cacheUnityInstallationOnMac: Input.cacheUnityInstallationOnMac,
       unityHubVersionOnMac: Input.unityHubVersionOnMac,
       dockerWorkspacePath: Input.dockerWorkspacePath,
+
+      // Remote PowerShell provider
+      remotePowershellHost: Input.remotePowershellHost,
+      remotePowershellCredential: Input.remotePowershellCredential,
+      remotePowershellTransport: Input.remotePowershellTransport,
+
+      // GitHub Actions provider
+      githubActionsRepo: Input.githubActionsRepo,
+      githubActionsWorkflow: Input.githubActionsWorkflow,
+      githubActionsToken: Input.githubActionsToken,
+      githubActionsRef: Input.githubActionsRef,
+
+      // GitLab CI provider
+      gitlabProjectId: Input.gitlabProjectId,
+      gitlabTriggerToken: Input.gitlabTriggerToken,
+      gitlabApiUrl: Input.gitlabApiUrl,
+      gitlabRef: Input.gitlabRef,
+
+      // Ansible provider
+      ansibleInventory: Input.ansibleInventory,
+      ansiblePlaybook: Input.ansiblePlaybook,
+      ansibleExtraVars: Input.ansibleExtraVars,
+      ansibleVaultPassword: Input.ansibleVaultPassword,
     };
   }