feat(render): add azldev component render command

Add 'azldev component render' to render post-overlay specs and sidecar
files for check-in. Processing uses a 3-phase pipeline:

1. Parallel source preparation (clone + overlay + synthetic git)
2. Batch mock processing (rpmautospec + spectool via Python script)
3. Parallel finishing (file filtering + copy to output)

Output directory safety model:
- Config rendered-specs-dir: auto-sets --force (trusted path)
- CLI --output-dir: requires --force for destructive ops
- Neither set: error with guidance
- Existing component dirs: require --force before overwrite
- Stale cleanup (-a): only with --force

Includes unit tests for all helper functions (findSpecFile,
cleanupStaleRenders, validateOutputDir, validateComponentName,
removeUnreferencedFiles, writeRenderErrorMarker).

Author: dmcilvaney

docs/user/reference/cli/azldev_component.md

@@ -29,4 +29,5 @@ components defined in the project configuration.`,
 	listOnAppInit(app, cmd)
 	prepareOnAppInit(app, cmd)
 	queryOnAppInit(app, cmd)
+	renderOnAppInit(app, cmd)
 }