fix(mcp): remove blocking parse tools

[suguanYang]

Summary

• remove the blocking knowhere_parse_url and knowhere_parse_file MCP tools from the full-access runtime surface
• keep parsing async-only through knowhere_async_parse_url, knowhere_async_parse_file, and knowhere_async_get_job_status
• update MCP README/tests and add a major changeset for the public tool-surface change

Verification

• pnpm --filter @ontos-ai/knowhere-mcp test:ci
• pnpm --filter @ontos-ai/knowhere-mcp typecheck
• pnpm --filter @ontos-ai/knowhere-mcp lint (passes with existing stdio.ts console warnings)
• pnpm --filter @ontos-ai/knowhere-mcp build
• node scripts/require-changeset.mjs origin/main

Checklist

• Tests were added or updated when behavior changed
• Public docs or examples were updated when needed
• A changeset was added when a release should be published