docs: sync documentation with code changes for v5.1.0

Changes applied:
- Updated version references from 5.0.0 to 5.1.0 (CLAUDE.md, CANONICAL-PATHS.md, setup.sh)
- Added missing projman commands to README.md (/suggest-version, /proposal-status)
- Added missing cmdb-assistant commands to README.md (/cmdb-audit, /cmdb-register, /cmdb-sync)
- Added /proposal-status to projman section in COMMANDS-CHEATSHEET.md
- Added 3 cmdb-assistant commands to COMMANDS-CHEATSHEET.md
- Added /suggest-version documentation to plugins/projman/README.md
- Added 4 missing scripts to CANONICAL-PATHS.md (verify-hooks.sh, setup-venvs.sh, venv-repair.sh, release.sh)

Fixes 14 documentation drift issues identified by /doc-guardian:doc-audit.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/setup.sh

@@ -324,7 +324,7 @@ print_report() {
 # --- Main ---
 main() {
     echo "=============================================="
-    echo "  Leo Claude Marketplace Setup (v5.0.0)"
+    echo "  Leo Claude Marketplace Setup (v5.1.0)"
     echo "=============================================="
     echo ""