test(fastmcp): Remove assertions on RootModel instances

[alexander-alderman-webb]

Description

Remove assertions that fail on the pre-release of fastmcp to avoid disproportionate complexity in the test suite.
The tests depend on the return type, and implicitly check non-interference of the SDK.

The cause is this breaking change in mcp with their major: https://github.com/modelcontextprotocol/python-sdk/blob/6f69a3758ebf2ee55ce050f58b470ce11af71133/docs/migration.md?plain=1#L420

Issues

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 98542 passed | ⏭️ 6772 skipped | Total: 105314 | Pass Rate: 93.57% | Execution Time: 350m 52s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	📈 +3
Failed Tests	📉 -3
Skipped Tests	—

➖ Removed Tests (3)

View removed tests

• test_segment_uses_downsampled_rate
  • File: tests.test_monitor
• test_trace_decorator_no_trx
  • File: tests.tracing.test_decorator
• test_continuous_profiler_auto_start_and_stop_sampled[experiment-thread]
  • File: tests.profiler.test_continuous_profiler

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 2499 uncovered lines.
✅ Project coverage is 89.84%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.84%    89.84%        —%
==========================================
  Files          193       193         —
  Lines        24588     24588         —
  Branches      8744      8744         —
==========================================
+ Hits         22089     22089         —
- Misses        2499      2499         —
- Partials      1400      1400         —

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Generated by Codecov Action

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