feat: implement optimization #2 - automated tag pushing control

Added --push/--no-push flag to release tag command for explicit control
over tag pushing behavior.

**Implementation**:
- Added --push/--no-push flag to CLI tag command (default: --push)
- Updated ReleaseManager.create_tag to accept push parameter
- Updated GitManager.create_tag to conditionally push based on flag
- Maintains backward compatibility (defaults to pushing)

**Usage**:
```bash
# Default behavior - creates and pushes tag
release tag --version 0.11.0

# Explicit push (same as default)
release tag --version 0.11.0 --push

# Create tag but don't push (manual push later)
release tag --version 0.11.0 --no-push
```

**Output when --no-push used**:
```
✅ Tag v0.11.0 created
💡 Push tag with: git push origin v0.11.0
```

**Benefits**:
- Makes push behavior explicit and controllable
- Prevents accidental pushes in some workflows
- Defaults to safe behavior (automatic push)
- Helpful reminder shown when --no-push used

**Files Modified**:
- capabilities/release-management/src/release_management/cli/main.py
- capabilities/release-management/src/release_management/core/manager.py
- capabilities/release-management/src/release_management/git/manager.py

Optimizations completed: 2/9 (High Priority)

capabilities/release-management/src/release_management/core/manager.py

@@ -75,12 +75,13 @@ class ReleaseManager:
         """
         return self.validator.validate_release_state(force=self.force)
 
-    def create_tag(self, version: str, message: Optional[str] = None) -> bool:
+    def create_tag(self, version: str, message: Optional[str] = None, push: bool = True) -> bool:
         """Create a git tag for the release.
 
         Args:
             version: Version to tag (e.g., "1.0.0")
             message: Optional tag message
+            push: Whether to push the tag to origin (default: True)
 
         Returns:
             True if tag created successfully, False otherwise
@@ -93,7 +94,7 @@ class ReleaseManager:
                 print(f"  - {issue}")
             return False
 
-        return self.git_manager.create_tag(version, message)
+        return self.git_manager.create_tag(version, message, push=push)
 
     def build_packages(self) -> bool:
         """Build release packages.