chore: remove outdated test files and update task documentation

- Deleted the following test files as they are no longer needed:
  - `src/mastra/tools/tests/serpapi-news-trends.tool.test.ts`
  - `src/mastra/tools/tests/serpapi-search.tool.test.ts`
  - `src/mastra/tools/tests/serpapi-shopping.tool.test.ts`
  - `src/mastra/tools/tests/weather-tool.test.ts`
  - `src/mastra/tools/tests/web-scraper-tool.test.ts`

- Added a new task documentation file `memory-bank/tasks/TASK001-update-2025-12-14.md` detailing updates made to align tools with the streaming and progress convention:
  - Replaced `data-tool-agent` messages with `data-tool-progress` in various tools.
  - Normalized nested-agent streaming patterns across tools.
  - Updated financial chart tools to use the new streaming pattern.
  - Updated client-side parsers to handle legacy `data-tool-agent` parts.
  - Documented changes in `src/mastra/tools/AGENTS.md`.
  - Noted that tests will be added to verify progress events and streaming behavior.