Unify OTel engine identity on agent spans and remove duplicate gen_ai.system

[Copilot]

Agent spans were emitting engine identity under gh-aw.engine while setup/conclusion spans use gh-aw.engine.id, fragmenting cross-span engine queries. Agent spans also emitted gen_ai.system twice due to re-adding an attribute already present in inherited attributes.

• Telemetry attribute normalization

  • Removed agent-span-specific emission of gh-aw.engine.
  • Agent spans now rely on shared attributes, so engine identity is consistently represented as gh-aw.engine.id across setup, conclusion, and agent spans.

• Duplicate attribute removal

  • Removed redundant agent-span push of gen_ai.system.
  • Agent spans now carry a single gen_ai.system value (inherited from conclusion attributes).

• Targeted test updates

  • Updated agent-span expectations from gh-aw.engine to gh-aw.engine.id.
  • Added an assertion that gen_ai.system appears exactly once on the agent span.
  • Kept unknown-engine fallback behavior intact (gen_ai.system falls back to raw engine ID).

const agentAttributes = [...attributes, ...usageAttrs];
agentAttributes.push(buildAttr("gen_ai.operation.name", "chat"));
// no extra push for gen_ai.system or gh-aw.engine;
// shared attributes already include gen_ai.system + gh-aw.engine.id

[Copilot]

Pull request overview

This PR normalizes telemetry attributes for agent spans so engine identity uses gh-aw.engine.id consistently and avoids duplicate gen_ai.system emission.

Changes:

• Removed agent-span-specific emission of gen_ai.system and gh-aw.engine.
• Updated agent span tests to expect inherited gh-aw.engine.id.
• Added test coverage ensuring gen_ai.system appears only once.

Show a summary per file

File	Description
actions/setup/js/send_otlp_span.cjs	Removes redundant agent span attributes so shared conclusion attributes provide engine/system identity.
actions/setup/js/send_otlp_span.test.cjs	Updates expectations for normalized engine attributes and adds duplicate gen_ai.system coverage.

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• Files reviewed: 2/2 changed files
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