v2: Support requirement levels on public v2 groups

[lmolkova]

Public v2 attribute groups now keep per-attribute requirement_level on their refs in the resolved and materialized schemas; internal groups and v1 are unaffected.

[Copilot]

Pull request overview

This PR updates the v2 resolved/materialized schema model so public v2 attribute groups preserve per-attribute requirement_level on their attribute references, and threads that value through generation, resolver import logic, fixtures, and tests.

Changes:

• Introduce v2 public attribute-group attribute reference/value wrappers (AttributeGroupAttributeRef / AttributeGroupAttribute) that carry requirement_level.
• Propagate group-specific requirement_level through semconv generation, forge materialization, and dependency importing (with updated tests/fixtures).
• Update v2 JSON schemas and schema documentation to reflect the new attribute-group attribute reference shape.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
schemas/semconv.resolved.v2.json	Resolved v2 schema: attribute-group attributes[] now uses an object ref that includes requirement_level.
schemas/semconv.materialized.v2.json	Materialized v2 schema: attribute-group attributes[] now includes requirement_level alongside attribute fields.
schemas/semconv-schemas.md	Docs updated to describe the new attribute-group attribute reference shape.
crates/weaver_semconv_gen/src/v2.rs	Generator updated to emit attribute-group attributes with group-specific requirement_level.
crates/weaver_resolver/src/dependency.rs	Dependency import path updated to preserve per-ref requirement_level when importing v2 public attribute groups; tests updated accordingly.
crates/weaver_resolver/data/registry-test-v2-5-published/registry/main.yaml	Test registry updated to author a non-default requirement_level on an attribute-group ref.
crates/weaver_resolver/data/registry-test-v2-5-published/published/resolved_schema.yaml	Updated published resolved-schema fixture to include { base, requirement_level } shape.
crates/weaver_resolver/data/registry-test-v2-5-published/expected-schema.yaml	Updated expected schema fixture to include { base, requirement_level } shape.
crates/weaver_resolver/data/registry-test-published-2/published/resolved_schema.yaml	Updated published resolved-schema fixture to include { base, requirement_level } shape.
crates/weaver_resolved_schema/src/v2/mod.rs	v1→v2 conversion updated so public attribute-group refs carry requirement_level; new test added.
crates/weaver_resolved_schema/src/v2/attribute_group.rs	Resolved-schema v2 attribute-group model updated so attribute refs include requirement_level.
crates/weaver_forge/src/v2/registry.rs	Forge materialization updated to carry per-ref requirement_level into materialized attribute-group attributes.
crates/weaver_forge/src/v2/attribute_group.rs	Forge v2 attribute-group model updated so attributes carry requirement_level.
CHANGELOG.md	Adds an Unreleased entry for this behavior change.

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[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.1%. Comparing base (2d53b1a) to head (6cd814a).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/weaver_forge/src/v2/registry.rs	88.8%	1 Missing ⚠️
crates/weaver_semconv_gen/src/v2.rs	90.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1584     +/-   ##
=======================================
- Coverage   81.1%   81.1%   -0.1%     
=======================================
  Files        130     130             
  Lines      11514   11519      +5     
=======================================
+ Hits        9347    9349      +2     
- Misses      2167    2170      +3     

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