docs(npm): fix stale MCP tool count in package README

[nhtkylc91]

Summary

• `pkg/npm/README.md` claimed 14 MCP tools, but the actual `TOOLS[]` registry in `src/mcp/mcp.c` defines 15 (verified by counting entries in the array), matching the count already stated in the root `README.md`.
• Fixes both occurrences in the npm package README so it's consistent with the source of truth and the other docs.

Test plan

• Counted tool definitions in `src/mcp/mcp.c`'s `TOOLS[]` array: 15.
• Confirmed root `README.md` and `pkg/npm/README.md` now agree (15).
• Docs-only change, no code/behavior affected.

[DeusData]

Thank you for the contribution and for checking the package README against the tool registry. This is now triaged as a normal-priority documentation correction for 0.9.1-rc. The tool-count point overlaps the newer #1297 and #1315 report and will need to be reconciled against the actual tools/list response during review. Our community PR queue is currently quite full, so it may take a little time before we can complete that review. We are doing our best to support community contributions and will return with code-grounded feedback as capacity opens.