Address the review of the search render card:
- The search result view carries no `content`: it was a no-op for every
consumer and serialized the whole search text twice. A UI without a search
card falls back to the raw tool/result content; the TUI stays byte-identical
to the pre-search-card generic fallback.
- Bound the serialized presentationMeta with a configurable searchMetaMaxBytes
(default 64 KiB): the inline item cap does not bound bytes, and spill-policy
only shrinks content, never meta. capMetaBytes drops trailing groups/paths.
- Share one retention pass (retainGrepMatches/retainGlobPaths in search-core)
between the model-facing render and the meta projection; remove the second
cap/preview implementation and the presentation<->grep module cycle by
moving GrepMatch/previewLine to search-core.
- Rename the result-view discriminant kind -> shape so it no longer collides
with GenericCallView.kind (ToolCallKind, whose values include 'search').
- Narrow the entry export surface to consumed symbols.
- Sync the three bilingual ToolResultView doc pairs and the Agent Note pair;
document the deliberate empty-card acceptance vs diffsFromMeta.
- Regenerate config/tool/cordis catalogs for the new config field.
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