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/git/manager.py

@@ -62,12 +62,13 @@ class GitManager:
         except subprocess.CalledProcessError:
             return {'is_repo': False}
 
-    def create_tag(self, version: str, message: Optional[str] = None) -> bool:
-        """Create and push git tag.
+    def create_tag(self, version: str, message: Optional[str] = None, push: bool = True) -> bool:
+        """Create and optionally push git tag.
 
         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 successful, False otherwise
@@ -85,16 +86,19 @@ class GitManager:
             self._run_command(['git', 'tag', '-a', tag_name, '-m', tag_message])
             print(f"✅ Tag {tag_name} created")
 
-            # Push tag to origin
-            try:
-                print(f"📤 Pushing tag to origin...")
-                self._run_command(['git', 'push', 'origin', tag_name])
-                print(f"✅ Tag pushed to origin")
-                return True
-            except subprocess.CalledProcessError as e:
-                print(f"⚠️  Could not push tag to origin: {e}")
-                print(f"You can push it manually with: git push origin {tag_name}")
-                return True  # Tag created successfully, push can be done manually
+            # Push tag to origin if requested
+            if push:
+                try:
+                    print(f"📤 Pushing tag to origin...")
+                    self._run_command(['git', 'push', 'origin', tag_name])
+                    print(f"✅ Tag pushed to origin")
+                    return True
+                except subprocess.CalledProcessError as e:
+                    print(f"⚠️  Could not push tag to origin: {e}")
+                    print(f"You can push it manually with: git push origin {tag_name}")
+                    return True  # Tag created successfully, push can be done manually
+            else:
+                return True  # Tag created successfully, user chose not to push
 
         except subprocess.CalledProcessError as e:
             print(f"❌ Failed to create tag: {e}")