fix(granola): resolve shared meeting links

[decofe]

Summary

• accept Granola /d/<uuid> and /t/<uuid>-<suffix> share links directly in granola get and granola transcript
• resolve share UUIDs to REST not_* IDs through canonical web_url values while passing normalized UUIDs to MCP
• require direct linked-meeting retrieval and fail closed instead of substituting semantic-search results

Testing

• PYTHONPATH=.:tools/productivity/granola uv run --no-project --with pytest --with httpx --with typer --with rich --with python-dotenv pytest -q tools/productivity/granola/test_client.py
• uv run --no-project python -m unittest services/sandbox/test_system_prompt.py
• uvx ruff check tools/productivity/granola/client.py tools/productivity/granola/test_client.py
• uvx ruff check --ignore E402,I001 tools/productivity/granola/cli.py
• git diff --check

Prompted by: @snario