Simplify validation in conformance tests

[lmolkova]

expected_spans becomes a dict[str, int] of exact per-operation span counts, and the base Scenario.validate fails on any mismatch (conformance replays recorded cassettes, so counts are deterministic). Scenarios pin real counts here instead of re-asserting them in redundant validate overrides.

[Copilot]

Pull request overview

This PR updates the GenAI conformance-test framework so scenarios declare exact per-operation span counts (by gen_ai.operation.name), and the base Scenario.validate() enforces an exact match, removing the need for redundant per-scenario span-count assertions.

Changes:

• Change Scenario.expected_spans from a tuple of operation names to a dict[str, int] of exact counts, and make Scenario.validate() fail on any mismatch (missing or extra operations).
• Update existing conformance scenarios across multiple instrumentations to declare the exact operation counts (and remove now-redundant validate overrides/imports).
• Update the conformance-test authoring skill documentation to reflect the new expected_spans contract.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
util/opentelemetry-test-util-genai/src/opentelemetry/test_util_genai/conformance.py	Switches span validation to exact per-operation counts and updates helper to return counts.
instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/tool_calling.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/inference.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/generate_content.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/embedding.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-genai-openai/tests/conformance/tool_calling.py	Updates expected span counts and removes redundant validate override/import.
instrumentation/opentelemetry-instrumentation-genai-openai/tests/conformance/responses_stream.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-genai-openai/tests/conformance/responses_conversation.py	Updates expected span counts and removes redundant validate override/import.
instrumentation/opentelemetry-instrumentation-genai-openai/tests/conformance/inference.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-genai-openai/tests/conformance/embedding.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-genai-openai-agents/tests/conformance/orchestration.py	Updates expected span counts and removes redundant span-count assertions in validate.
instrumentation/opentelemetry-instrumentation-genai-langchain/tests/conformance/workflow.py	Updates expected span counts and removes redundant validate override/import.
instrumentation/opentelemetry-instrumentation-genai-langchain/tests/conformance/tool_calling.py	Updates expected span counts and removes redundant validate override/import.
instrumentation/opentelemetry-instrumentation-genai-langchain/tests/conformance/inference.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-genai-langchain/tests/conformance/agent.py	Updates expected span counts and removes redundant validate override/import.
instrumentation/opentelemetry-instrumentation-genai-anthropic/tests/conformance/tool_calling.py	Updates scenario to declare exact span operation counts.
instrumentation/opentelemetry-instrumentation-genai-anthropic/tests/conformance/inference.py	Updates scenario to declare exact span operation counts.
.github/skills/write-conformance-tests/SKILL.md	Documents the new expected_spans: dict[str, int] behavior and guidance.

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