Rename Cloud Runner to Orchestrator (#775)

* Rename "Cloud Runner" to "Orchestrator" across entire codebase

Breaking change: All CloudRunner classes, options, environment variables,
and action.yml inputs have been renamed to Orchestrator equivalents.

- Renamed src/model/cloud-runner/ directory to src/model/orchestrator/
- Renamed all cloud-runner-* files to orchestrator-*
- Renamed all CloudRunner* classes to Orchestrator* (15+ classes)
- Renamed all cloudRunner* properties to orchestrator* equivalents
- Renamed CLOUD_RUNNER_* env vars to ORCHESTRATOR_*
- Updated action.yml [CloudRunner] markers to [Orchestrator]
- Updated workflow files and package.json test scripts
- Updated all runtime strings (cache paths, log messages, branch refs)
- Rebuilt dist/index.js

No backward compatibility layer is provided.

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

* Remove tracked log/temp files and add to .gitignore

Remove $LOG_FILE and temp/job-log.txt debug artifacts that should
not be in the repository.

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

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/model/image-environment-factory.ts

@@ -84,7 +84,7 @@ class ImageEnvironmentFactory {
       { name: 'RUNNER_WORKSPACE', value: process.env.RUNNER_WORKSPACE },
     ];
 
-    // Always merge additional variables (e.g., secrets/env from Cloud Runner) uniquely by name
+    // Always merge additional variables (e.g., secrets/env from Orchestrator) uniquely by name
     for (const element of additionalVariables) {
       if (!element || !element.name) continue;
       environmentVariables = environmentVariables.filter((x) => x?.name !== element.name);