## Summary
Adds the semantic-convention evolution foundation:
- vendors the OpenTelemetry schema and SigNoz overlay
- generates Go and TypeScript family tables deterministically
- exposes the Go resolver API for family members, current names, and
historical names
- adds generation checks and unit tests
Related to #6143.
## Stack
1. #12441 — Foundations (base: main)
2. #12442 — Phase 1 query (base: #12441)
3. #12443 — Phase 1 services (base: #12442)
4. #12444 — Phase 1 closure gate (base: #12443)
5. #12445 — Phase 2 signals (base: #12444)
6. #12446 — Phase 3 migration UX (base: #12445)
7. #12447 — Phase 4 rollout (base: #12446)
**Current layer:** #12441
## Testing
- `go test ./scripts/semconv`
- `go test ./pkg/types/telemetrytypes/semconv`
- `make semconv-check`
## Risk and rollback
This layer is additive apart from CI generation checks. Roll back by
reverting this PR; no stored telemetry is changed.
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