Add optional name field to SpanRefinement

[Copilot]

SpanRefinement cannot override the name structure from its base span, preventing provider-specific span name formats (e.g., GenAI conventions that explicitly allow individual systems to specify different span name formats).

Changes

• crates/weaver_semconv/src/v2/span.rs: Add name: Option<SpanName> to SpanRefinement, with serde skip-if-none. Added tests for parsing with and without the field.
• schemas/semconv-syntax.v2.md: Document the new optional name property in span_refinements definition.
• schemas/semconv.schema.v2.json: Regenerated JSON schema to include the new optional name field.

Usage

span_refinements:
  - id: gen_ai.inference.client
    ref: gen_ai.client
    name:
      note: "{gen_ai.operation.name} {gen_ai.request.model}"
    brief: GenAI inference client span
    attributes:
      - ref: gen_ai.operation.name
        requirement_level: required

Resolution: if the refinement sets name, the entire name structure replaces the base span's name; otherwise, the base span's name is inherited. The resolved schema and forge crates already propagate name through their flattened Span struct, so no changes needed there.

[lmolkova]

@copilot go fix ci errors

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.4%. Comparing base (69132ef) to head (6a6978c).

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1403     +/-   ##
=======================================
- Coverage   82.4%   82.4%   -0.1%     
=======================================
  Files        120     120             
  Lines      10092   10092             
=======================================
- Hits        8320    8319      -1     
- Misses      1772    1773      +1     

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[Copilot]

@copilot go fix ci errors

Fixed in afaf1d3 — two issues: a rustfmt formatting nit in the test file, and the schemas/semconv.schema.v2.json needed regeneration to include the new optional name field on SpanRefinement.