fix(pydantic-ai): Stop emitting duplicate spans

[alexander-alderman-webb]

Description

Do not create a duplicate AI Client span in the cases that ModelRequestNode.run() or ModelRequestNode.stream() hit an early return path in which no model request is made.

Replace len(chat_spans) >= 1 with len(chat_spans) == 1 in tests.

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

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[github-actions]

Codecov Results 📊

✅ 99162 passed | ⏭️ 6479 skipped | Total: 105641 | Pass Rate: 93.87% | Execution Time: 363m 15s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	📈 +1
Failed Tests	📉 -1
Skipped Tests	—

➖ Removed Tests (1)

View removed tests

• test_continuous_profiler_auto_start_and_stop_sampled[experiment-gevent]
  • File: tests.profiler.test_continuous_profiler

All tests are passing successfully.

❌ Patch coverage is 66.67%. Project has 2509 uncovered lines.
✅ Project coverage is 89.95%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/pydantic_ai/patches/graph_nodes.py	66.67%	⚠️ 3 Missing and 1 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.95%    89.95%        —%
==========================================
  Files          193       193         —
  Lines        24955     24964        +9
  Branches      9004      9008        +4
==========================================
+ Hits         22448     22455        +7
- Misses        2507      2509        +2
- Partials      1437      1437         —

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