fix(search): make DirectCollection::getEntitiesWithData() linear

The method resolved each entity name with a separate retrieveRow() call,
each of which rescans the entity index from the start, makin

fix(search): make DirectCollection::getEntitiesWithData() linear

The method resolved each entity name with a separate retrieveRow() call,
each of which rescans the entity index from the start, making the whole
operation quadratic in the number of entities. This runs on
MetadataSearch::getPages('title') and hurts large wikis. Collect the entity
IDs in one pass and resolve their names with a single batched retrieveRows()
read instead.

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fix(search): restore histogram() as a Collection method with a BC shim

The indexer rework dropped Doku_Indexer::histogram(), which plugins reach
through idx_get_indexer()->histogram() to build tag c

fix(search): restore histogram() as a Collection method with a BC shim

The indexer rework dropped Doku_Indexer::histogram(), which plugins reach
through idx_get_indexer()->histogram() to build tag clouds (e.g. tagfilter
via the 'subject' metadata index). Calling it fatalled through
LegacyIndexer::__call as an undefined method.

Add histogram() to AbstractCollection: it sums each token's frequency across
all entities and returns them ordered by frequency, filtered by min/max/minlen,
handling both length-split (fulltext) and single-group (metadata) collections.
DirectCollection overrides it for the 1:1 title case (count shared values).
LegacyIndexer::histogram() is a deprecated shim dispatching by $key to the
matching collection.

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SearchIndex: rector, phpcs, type hint fixes

SearchIndex: add integrity checking to Collection architecture

Add checkIntegrity() to AbstractCollection and DirectCollection that
verifies paired indexes have matching line counts (token==frequenc

SearchIndex: add integrity checking to Collection architecture

Add checkIntegrity() to AbstractCollection and DirectCollection that
verifies paired indexes have matching line counts (token==frequency,
entity==reverse, entity==token for direct collections). Throws
IndexIntegrityException on the first inconsistency found.

Add Countable interface to AbstractIndex with count() implementations
in MemoryIndex and FileIndex. Add Indexer::checkIntegrity() and
Indexer::isIndexEmpty() to orchestrate checks across all collections.

Update infoutils.php to use the new Indexer API instead of the old
FulltextIndex/MetadataIndex classes.

Fix range(1, 0) bug in three places that produced [1, 0] instead of
an empty array when split-by-length indexes were empty.

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SearchIndex: rewrite MetadataSearch to use Collection classes

Replace MetadataIndex usage in MetadataSearch with the new Collection/Index
architecture. This completes the read-path migration so data

SearchIndex: rewrite MetadataSearch to use Collection classes

Replace MetadataIndex usage in MetadataSearch with the new Collection/Index
architecture. This completes the read-path migration so data written by the
Collection-based Indexer is read back correctly using TupleOps tuple format.

Generalize FrequencyCollectionSearch into CollectionSearch that works with any
AbstractCollection type (Frequency, Lookup, Direct) and handles both
split-by-length and non-split index layouts transparently. DirectCollection
participates via resolveTokenFrequencies() which maps token RID = entity RID.

Key changes:
- AbstractCollection gains isSplitByLength(), resolveTokenFrequencies(),
getEntitiesWithData(), and groupToSuffix() with validation
- Index groups are now int (0 = non-split, positive = token length)
- CollectionSearch provides both addTerm()/execute() for fulltext and
lookup() for metadata-style search (exact/wildcard/callback)
- MetadataSearch delegates entirely to collection APIs
- Shared filterPages() replaces duplicated page filtering logic
- All callers updated from MetadataIndex to MetadataSearch
- Tests moved to Search namespace with full coverage for new APIs

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SearchIndex: rewrite Indexer to use Collection classes

Replace the intermediate #2943 classes (FulltextIndex, MetadataIndex)
with the new Collection-based architecture. The Indexer is now a thin
sta

SearchIndex: rewrite Indexer to use Collection classes

Replace the intermediate #2943 classes (FulltextIndex, MetadataIndex)
with the new Collection-based architecture. The Indexer is now a thin
stateless orchestrator that delegates all index work to collections.

Key changes:
- Indexer no longer extends AbstractIndex; page name passed to methods
- addPage/deletePage/clear use PageTitleCollection,
PageFulltextCollection, and PageMetaCollection
- New PageMetaCollection replaces separate ReferencesCollection and
MediaCollection with a single class that handles arbitrary metadata
keys dynamically
- Shared writable FileIndex('page') passed to all collections
- Logger callback replaces verbose parameter
- Methods return void instead of bool
- Index classes implement IteratorAggregate for clean data access
- Indexer tests consolidated into namespaced IndexerTest.php
- All callers updated to new stateless API

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SearchIndex: add DirectCollection for 1:1 entity-token mappings

Introduce DirectCollection as a third collection type alongside
FrequencyCollection and LookupCollection. Direct collections store
exa

SearchIndex: add DirectCollection for 1:1 entity-token mappings

Introduce DirectCollection as a third collection type alongside
FrequencyCollection and LookupCollection. Direct collections store
exactly one token per entity at the entity's position in the token
index (entity.RID === token.RID), with no frequency or reverse indexes.

AbstractCollection now accepts optional frequency/reverse index names
(default to '') and skips locking empty index names.

Adds PageTitleCollection as the first concrete direct collection
for the page -> title mapping.

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