SearchIndex: remove write side effect from retrieveRow()

retrieveRow() padded the index file when the requested RID was beyond
the current length. This was an optimization for subsequent changeRow()

SearchIndex: remove write side effect from retrieveRow()

retrieveRow() padded the index file when the requested RID was beyond
the current length. This was an optimization for subsequent changeRow()
calls, but changeRow() already handles padding on its own. The side
effect was also inconsistent with retrieveRows() which is a pure read.

Added a cross-index integration test verifying RID consistency across
entity, token, frequency and reverse indexes when multiple entities
share tokens.

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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: reorganize and expand test suite

Move all Search tests from _test/tests/inc/Search/ to _test/tests/Search/
to match the dokuwiki\test autoloader convention. Fix namespaces from
tests\*

SearchIndex: reorganize and expand test suite

Move all Search tests from _test/tests/inc/Search/ to _test/tests/Search/
to match the dokuwiki\test autoloader convention. Fix namespaces from
tests\* to dokuwiki\test\* so all tests work in isolation.

Extract inline test helpers into separate autoloadable mock files:
TestDirectCollection → MockDirectCollection, TestLookupCollection →
MockLookupCollection, TestFrequencyCollection → MockFrequencyCollection.

Rename AbstractIndexTest → AbstractIndexTestCase to fix PHPUnit warning
about abstract classes with Test suffix.

Replace dead xxxRealWord() with proper testWildcardSearch() verifying
exact token matches and frequencies for all three wildcard types.
Add testTokenizedPageSearch() using a dedicated test data file. Add
testNoMatchReturnsEmptyFrequencies() which exposed a bug in Term where
uninitialized $tokens/$frequencies caused crashes on zero-match terms.

Replace fulltext_query.test.php with modern QueryParserTest in the
Search\Query namespace.

Add new test files:
- LockTest: acquire/release, reference counting, stale lock override,
foreign lock rejection, releaseAll, independent locks
- NamespacePredicateTest: filter/exclude, sub-namespaces, partial prefix
safety, empty sets, score preservation
- PageSetTest: intersect, unite, subtract, isEmpty
- QueryEvaluatorTest: word lookups, AND/OR/NOT, namespace filtering,
combined queries, partial namespace prefix safety

Fix Term.php: initialize $tokens and $frequencies to [] instead of null.

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