Back to Search-quality baseline: acronym / synonym recall (Phase 1.4, v1.2.0 candidate)

Following the `feedback_code_changes_as_ideas_for_future` rule, three candidate paths, in increasing complexity:

1. Boost canonical framework root in the rewrite path. When a bare query (no `--framework`) matches a `framework_aliases.synonyms` entry, append the canonical framework slug to the query as an OR clause: `nfc OR corenfc`. This should pull the canonical framework root up. Small surgical change in the SmartQuery layer.

1. Per-source authority boost when the query matches a synonym. When the query matches a synonyms entry, give the matching framework a temporary RRF source-weight bonus. Larger change but follows the existing source-weight pattern.

1. Document synonym usage in the CLI help. The current `cupertino search` help doesn't mention that `--framework` arguments accept synonyms. If the synonyms are filter-only, this should be made discoverable so users know to type `--framework nfc` rather than expecting bare-query synonym routing.

None is proposed as immediate work. The baseline exists so that any future change to the synonyms mechanism is measured against this 18% top-1 baseline as the regression starting point.