Add rpa-run-tab skill

A Tebra-style Run tab for desktop PyQt6 bots, built in about 5 minutes:
Trigger button, Excel input card, progress with timer, live log, checkpoint
boxes with time limits, and green/amber/red endings. It is checked with a
fake bot (run_tab.py --selfcheck). The design decisions are in rpa-run-tab/docs/adr.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,3 @@
+rpa-run-tab/logs/
+__pycache__/
+*.pyc