#### Description
Phase 2 of #6143: semantic-convention families resolve on logs and
metrics, behind the `resolve_semconv_families` flag (default off), on
the storage contract of #12802.
- Registry: each member carries the scope of its own rename edges, so a
fan-out keeps one membership per target and an ambiguous name stays
literal.
- Logs and metrics families need no family code of their own. The gate
applies to every signal, and `LogicalRead` merges members through each
storage's `Read`.
- Metric-name families union the storage names in every `metric_name`
filter, and the querier reads type, temporality, and the reduced flag
across the family.
- Span-metrics labels: the metrics the processor emits, listed by name,
also read each family member with the `resource_` prefix. Requested
names are never rewritten.
- Values suggestions and related values cover every spelling of the
family.
- `deployment.environment.name` resolves on all three signals.
`db.system.name` stays off until a value-mapping reader exists.
#### Additional Information
- `pkg/semconv.Family` fields are now unexported, and `transition.go` is
removed. #12446 reads the old API and needs an update when stacked.
- A target that emits both names of a metric-name family double-counts
in `sum()` during the overlap window. Reading both names is the feature.
Pinned by a test.
- A family of metrics labels keeps the keyless contract of a single
label: no guard, no NULL group.
## 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.
