Remove old bash scripts and bump version to 1.2.8

- Removed check-github-projects.sh (replaced by .py)
- Removed gh-project-add-columns.sh (replaced by .py)
- Removed sync_cpv_validators.sh (replaced by .py)
- Bumped version from 1.2.7 to 1.2.8
- Validation: 0 issues, 0 warnings, 947 passed

Author: Emasoft

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "ai-maestro-orchestrator-agent",
-  "version": "1.2.7",
+  "version": "1.2.8",
   "description": "Task distribution, agent coordination, progress monitoring - executes plans via subagents. Requires AI Maestro for inter-agent messaging.",
   "author": {
     "name": "Emasoft",