refactor(fs): minimize and cap search card meta; keep TUI byte-identical

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.

packages/cordis/tool-cordis/src/api-catalog.ts

@@ -2165,11 +2165,11 @@ export const TYPE_API: readonly TypeApiEntry[] = [
   },
   {
     name: 'SearchMatchesResultView',
-    declaration: 'export interface SearchMatchesResultView {\n    card: \'search\';\n    kind: \'matches\';\n    title?: string;\n    files: SearchFileMatches[];\n    truncated: boolean;\n    total: number;\n    content?: ContentBlock[];\n}',
+    declaration: 'export interface SearchMatchesResultView {\n    card: \'search\';\n    shape: \'matches\';\n    title?: string;\n    files: SearchFileMatches[];\n    truncated: boolean;\n    total: number;\n}',
   },
   {
     name: 'SearchPathsResultView',
-    declaration: 'export interface SearchPathsResultView {\n    card: \'search\';\n    kind: \'paths\';\n    title?: string;\n    paths: string[];\n    truncated: boolean;\n    total: number;\n    content?: ContentBlock[];\n}',
+    declaration: 'export interface SearchPathsResultView {\n    card: \'search\';\n    shape: \'paths\';\n    title?: string;\n    paths: string[];\n    truncated: boolean;\n    total: number;\n}',
   },
   {
     name: 'SearchResultView',