fix(providers): add polling timeouts, fix credential parsing, validate dependencies

- GitHub Actions: max 4-hour polling with clear timeout error including run URL
- GitLab CI: max 4-hour polling with clear timeout error including pipeline URL
- Remote PowerShell: fix credential split to preserve passwords with colons
  (split on first colon only instead of all colons)
- Remote PowerShell: throw clear error when credential format is invalid
- Ansible: validate ansible-playbook binary exists in setupWorkflow
  (separate from ansible --version check)
- All timeout errors use core.error() for GitHub Actions annotation visibility

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

src/model/orchestrator/providers/ansible/index.ts

@@ -1,3 +1,4 @@
+import * as core from '@actions/core';
 import BuildParameters from '../../../build-parameters';
 import { OrchestratorSystem } from '../../services/core/orchestrator-system';
 import OrchestratorEnvironmentVariable from '../../options/orchestrator-environment-variable';
@@ -53,6 +54,15 @@ class AnsibleProvider implements ProviderInterface {
       throw new Error(`Ansible not found on PATH: ${error.message || error}`);
     }
 
+    // Verify ansible-playbook binary exists (may be separate from ansible)
+    try {
+      await OrchestratorSystem.Run('command -v ansible-playbook || which ansible-playbook || where ansible-playbook');
+      OrchestratorLogger.log(`[Ansible] ansible-playbook binary verified`);
+    } catch (error: any) {
+      core.error('ansible-playbook not found. Install Ansible or ensure it is in PATH.');
+      throw new Error(`ansible-playbook not found on PATH: ${error.message || error}`);
+    }
+
     // Verify inventory exists
     try {
       await OrchestratorSystem.Run(`test -e "${this.inventory}"`);