SearchIndex: use FileIndex for title token index

PageTitleCollection accesses titles by RID (one line at a time), so
loading the entire index into memory is wasteful. Override getTokenIndex()
to ret

SearchIndex: use FileIndex for title token index

PageTitleCollection accesses titles by RID (one line at a time), so
loading the entire index into memory is wasteful. Override getTokenIndex()
to return a FileIndex, matching the line-by-line access pattern used on
master.

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SearchIndex: add backward compatibility wrappers

Add deprecated wrappers for idx_* and ft_* functions that were removed
when inc/indexer.php and inc/fulltext.php were replaced by the new
Search clas

SearchIndex: add backward compatibility wrappers

Add deprecated wrappers for idx_* and ft_* functions that were removed
when inc/indexer.php and inc/fulltext.php were replaced by the new
Search classes. These wrappers delegate to the new architecture and
ensure existing plugins continue to work.

Deprecated standalone functions: idx_get_indexer, idx_getIndex,
idx_lookup, idx_listIndexLengths, idx_indexLengths, ft_pageSearch,
ft_backlinks, ft_mediause, ft_pageLookup, ft_snippet, ft_pagesorter,
ft_snippet_re_preprocess, ft_queryParser.

Deprecated methods on Indexer: lookupKey, getPages, addMetaKeys,
renameMetaValue, getPID, lookup.

Also migrates remaining core callers (Ajax, FeedCreator, ApiCore) to
use the new classes directly and fixes a UTF-8 case folding bug in
MetadataSearch title lookups.

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SearchIndex: remove legacy intermediate classes from PR #2943

Remove FulltextIndex, MetadataIndex, and the old AbstractIndex which
were introduced as a stepping stone in #2943. All callers now use t

SearchIndex: remove legacy intermediate classes from PR #2943

Remove FulltextIndex, MetadataIndex, and the old AbstractIndex which
were introduced as a stepping stone in #2943. All callers now use the
Collection/Index architecture directly.

Also fix a bug in detail.php where mediause() was called with
ignore_perms=true, leaking references from hidden/protected pages
to unprivileged users. This bug existed on master as well.

Old test files replaced by their modernized equivalents in tests/Search/.

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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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SearchIndex: rewrite FulltextSearch to use FrequencyCollectionSearch

Replace FulltextIndex->lookupWords() with FrequencyCollectionSearch which
correctly handles the compact tuple format written by t

SearchIndex: rewrite FulltextSearch to use FrequencyCollectionSearch

Replace FulltextIndex->lookupWords() with FrequencyCollectionSearch which
correctly handles the compact tuple format written by the new Indexer.

Introduce QueryEvaluator with typed stack entries (PageSet,
NamespacePredicate, NegatedEntry) for RPN query evaluation. NOT wraps
its operand instead of computing a universe complement, so AND with a
negated operand becomes efficient set subtraction. The full page index
is only loaded for standalone negative or namespace-only queries.

Move QueryParser and QueryEvaluator into the new Search\Query namespace
along with the stack entry types.

Simplify FulltextSearch to orchestration: parse query, look up words,
evaluate, filter, sort. Replace FT_SNIPPET_NUMBER constant with
maxSnippets property. Combine ACL/existence/time filtering into a
single pass.

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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: accept pre-instantiated entity and token indexes in collections

Allow passing AbstractIndex objects for the entity and token
parameters instead of string names. This enables sharing ind

SearchIndex: accept pre-instantiated entity and token indexes in collections

Allow passing AbstractIndex objects for the entity and token
parameters instead of string names. This enables sharing index
instances between collections for efficiency.

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SearchIndex: rewrite Lock as static registry with reference counting

Replace the instance-based Lock class with a static registry that
tracks held locks per-process with reference counting. This sol

SearchIndex: rewrite Lock as static registry with reference counting

Replace the instance-based Lock class with a static registry that
tracks held locks per-process with reference counting. This solves
three problems:

- Split indexes (w3, w4, ...) share a single lock name and now
coordinate naturally via the registry
- Multiple callers can acquire the same lock without conflict
- Indexes enforce their own writability through lock()/unlock()
methods on AbstractIndex

The Lock registry manages both the filesystem lock (mkdir) and the
in-process tracking. The first acquire creates the directory, subsequent
acquires increment the refcount. Release decrements, and only removes
the directory when the count reaches zero.

Note: I am not sure if implementing this as a static object is a great
idea or if we should pass an instance through the collection to the
indexes...

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SearchIndex: fix lock() releasing foreign locks on partial failure

Track successfully acquired locks in $lockedIndexes so that
unlock() only releases locks this collection actually holds.
Previously

SearchIndex: fix lock() releasing foreign locks on partial failure

Track successfully acquired locks in $lockedIndexes so that
unlock() only releases locks this collection actually holds.
Previously, a failed lock acquisition would call unlock() which
released all index locks including ones never acquired, potentially
releasing locks held by other processes.

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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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SearchIndex: extract Collection base class hierarchy

Introduce AbstractCollection as the shared base for all index
collections, with FrequencyCollection and LookupCollection as
the two abstract subc

SearchIndex: extract Collection base class hierarchy

Introduce AbstractCollection as the shared base for all index
collections, with FrequencyCollection and LookupCollection as
the two abstract subclasses differing only in how tokens are
counted (frequency vs dedup).

Key design decisions:
- splitByLength is a constructor parameter on AbstractCollection
controlling whether token/frequency indexes use length-based
file splitting. This is independent of the collection type.
- The reverse index format is self-describing: entries with *
have a group prefix (split), entries without don't (non-split).
No branching needed in parse/format methods.
- addEntity, resolveTokens, updateIndexes, and reverse index
handling all live in AbstractCollection. Subclasses only
implement countTokens().

Concrete collections: PageFulltextCollection (frequency, split),
MediaCollection and ReferencesCollection (lookup, non-split).

Renames FulltextCollection -> PageFulltextCollection and
FulltextCollectionSearch -> FrequencyCollectionSearch.

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update SearchIndex concept doc

SearchIndex: RID cache should not be static

A static var interferes when the same class is instantiated multiple
times

SearchIndex: more Term tests

fix type hint for exception (implicit null issue)

SearchIndex: TupleOps now work with frequencies of 1

We have indexes where we simply track that a relation between entity and
token exists, but there is no frequency. The frequency is always 1.
For

SearchIndex: TupleOps now work with frequencies of 1

We have indexes where we simply track that a relation between entity and
token exists, but there is no frequency. The frequency is always 1.
For those indexes we do not store *1 as frequency but omit it
completely.

The TupleOps class now can work with such indexes and will also store
frequencies of 1 like this.

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�� Rector and PHPCS fixes

replace E_USER_ERROR triggers with RuntimeExceptions

The use of trigger_error with a E_USER_ERROR is deprecated in PHP 8.4

Use str_starts_with/str_ends_with

code style: operator spacing

coding style: control flow line breaks

coding style: control flow whitespaces

recover comments in list