fix: add annotation titles to all MCP tools (#149)

[agent-think]

Closes #149

What was wrong

The MCP server exposed tools without consistent annotations.title values. In Code-Mode the SDK-derived tool registrations for docs, search, and execute only set descriptions/inputs, and the non-Code-Mode precomputed artifact generated in src/openapi.ts did not produce a human-readable title for any of the ~3,000 endpoint tools. Clients that prefer title (or annotations.title) over the raw tool name therefore showed machine-oriented labels like get_accounts_workers_scripts.

What changed

• Added explicit title and annotations.title to every Code-Mode tool:
  • docs → "Cloudflare Docs Search" (src/tools/docs-search.ts)
  • search → "Cloudflare API Spec Search" (src/tools/search.ts)
  • execute → "Cloudflare API Code Executor" (src/tools/execute.ts)
• Added a generated title to each non-Code-Mode endpoint tool by introducing toolNameToTitle in src/openapi.ts and threading it through NonCodemodeTool/buildNonCodemodeTools/toWireTool (src/tools/non-codemode.ts). The title title-cases the stable machine name and keeps common prepositions lower-case (e.g. get_accounts_workers_scripts_by_script_name → "Get Accounts Workers Scripts by Script Name").
• Updated attachMetrics in src/metrics.ts to mirror tool.title into annotations.title when only a top-level title is supplied, ensuring both fields are populated consistently without manual duplication.
• Added/updated tests covering:
  • docs title and annotations.title
  • search and execute titles via the real worker
  • Non-Code-Mode endpoint titles
  • toolNameToTitle formatting including by suffix

Raw tool names remain unchanged, preserving machine invocation stability.

Testing

• npm run lint — clean
• npm run format:check — clean
• npm run typecheck — clean
• npm run test -- --run — 271 tests passed

🤖 generated by the pr-agent — please review carefully