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#### Description - A referenced name in a trace query now resolves to a `LogicalField` (#12499): one field, addressed by the requested spelling, backed by its physical member keys. A semantic-convention family (`deployment.environment.name` / `deployment.environment`) merges into one expression with current-wins precedence; the response keeps the requested spelling. - `FieldMapper` gets one new method, `ExistsFor` (the per-key presence primitive). `LogicalValueExpr` and `LogicalExistsExpr` build all family SQL in one place from `FieldFor` and `ExistsFor`; no signal implements family logic. - Statement builders prefetch sibling spellings; the metadata store stays family-blind and autocomplete stays literal. Traces and the resource filter compile per logical field; logs, metrics, and the other signals keep their SQL unchanged. - The `resolve_semconv_families` feature flag (default: disabled) gates all family behavior. With the flag off, the generated SQL is the same as main; tests pin this. Part of #6143. #### Additional Information - Stack: #12441 (merged) → **#12442** → #12443 → #12444 → #12445 → #12446 → #12447. This layer bases on main. - Rollback: turn the flag off; stored telemetry is untouched.