Add -R restart operation for timer and service jobs

Resets the countdown for timer jobs and restarts the process for
service jobs. Disabled jobs are refused with a clear error message.
Accepts hex ID or name like all other management operations.

- restartJob() function with disabled-job guard
- getopts R:, manage_count, mutual-exclusion error messages updated
- 9 new tests in test.sh (112 total), 1 new tape command (24 total)
- README options table, names prose, and future-ideas checklist updated

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

badges/tests.json

@@ -1,6 +1,6 @@
 {
   "schemaVersion": 1,
   "label": "tests",
-  "message": "127 passed",
+  "message": "136 passed",
   "color": "brightgreen"
 }