Add annotation titles to all MCP tools

[mattzcarey]

Summary

Add explicit MCP annotations.title values to all tools exposed by cloudflare/mcp, so clients can display consistent human-readable tool labels.

Context

While adding the new docs tool, we noticed clients may display annotations.title instead of the raw tool name. We removed a one-off title from docs to keep it displaying as docs, but the better long-term approach is to define titles deliberately and consistently across every tool.

Proposal

• Audit all registered tools in both code mode and non-code mode.
• Add annotations.title for each tool using a consistent naming convention.
• Keep raw tool names stable for machine invocation.
• Preserve useful annotations such as readOnlyHint where applicable.
• Add/update tests to assert each registered tool has the expected title.

Acceptance criteria

• Every exposed tool has an intentional annotations.title.
• Tool titles are consistent across code mode and ?codemode=false.
• Tests cover the registered annotations.