This is part 3 of stacked PRs for DevTools comments support.
Implements `DevToolsCommentBridge`, `McpPage` and `McpContext` bridge
integration, full handlers for comment tools.
### Stack
1. #2692 chore: add hidden devtoolsComments flag
2. #2693 chore: add comments and open_devtools tools without
implementation
3. **#this PR**: chore: implement bridge and DevTools comments tools
4. Skill PR
Alex Rudenko