Parsing: make parse syntax a per-parse value, drop ModeInterface

The active parse's syntax flavour is a per-parse question, not process-
global state: within a single request a plugin can render bun

Parsing: make parse syntax a per-parse value, drop ModeInterface

The active parse's syntax flavour is a per-parse question, not process-
global state: within a single request a plugin can render bundled
DokuWiki-syntax text inside an otherwise-Markdown page. Yet ModeRegistry
was a singleton that read $conf['syntax'] and the $PARSER_MODES global,
and every mode reached it through ModeRegistry::getInstance() — so the
flavour lived in shared mutable state that two parses in one request
would fight over.

Make the registry a short-lived value instead:

- ModeRegistry is constructed once per parse with an explicit $syntax
and injected into Parser, Handler and every mode. getSyntax() /
isDwPreferred() / isMdPreferred() consult $this->syntax; the
DOKU_UNITTEST-gated mode-list cache hack is gone (each registry is
fresh, nothing to invalidate).
- p_get_instructions() is now the single place in the pipeline where
$conf['syntax'] is read; from there the flavour travels as a
parameter. No code under inc/Parsing/ reads $conf['syntax'] directly
anymore — the five syntax-reading modes (Preformatted, GfmHr,
GfmEscape, Externallink, GfmQuote) route through $this->registry.

Keep the two concepts apart, as documented in the ModeRegistry and
AbstractMode docblocks: the user's configured *preference* stays in
$conf['syntax'] for UI code (toolbar, settings), while the active
parse's syntax is a parameter carried by the registry.

$PARSER_MODES is demoted to a deprecated, read-only mirror, published
during loadPluginModes() — third-party syntax plugins (columnlist,
alphalist2, phpwikify, skipentity) and the bundled info plugin read the
global directly, often from their constructors, so the taxonomy must
stay visible there. No core code reads the mirror.

Fold ModeInterface into AbstractMode while here: getSort()/handle() are
abstract, the connect callbacks carry defaults, and the public $Lexer
"FIXME should be done by setter" becomes setLexer()/getLexer() injected
by Parser::addMode() alongside the registry. Nested-content resolution
moves to the allowedCategories()/filterAllowedModes() hooks, resolved
once when the registry is attached.

Tests build their own parser/registry through ParserTestBase::setSyntax()
instead of mutating $conf and calling the removed ModeRegistry::reset().

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Merge branch 'master' into gfm

* master:
test: add tests to catch #4637

test: add tests to catch #4637

Issue #4637 was fixed in 7686f2030b19f948d2e50df1613ef6592fa44b46 but I
didn't like that no test had caught the issue.

This adds a specific test for the issue as a Ha

test: add tests to catch #4637

Issue #4637 was fixed in 7686f2030b19f948d2e50df1613ef6592fa44b46 but I
didn't like that no test had caught the issue.

This adds a specific test for the issue as a HandlerTest. Additionally a
simple smoke test is added that renders the wiki:syntax page and
inspects the created DOM. It's not comprehensive but might help flagging
similar issue in the future.

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add sub-parser support to Handler / Parser / ModeRegistry

A block mode that wants to parse the body of one of its captured
matches needs a second Parser instance configured with the active
modes min

add sub-parser support to Handler / Parser / ModeRegistry

A block mode that wants to parse the body of one of its captured
matches needs a second Parser instance configured with the active
modes minus whatever would re-enter the outer mode. Doing this by
hand is verbose and easy to get wrong — modes hold a $Lexer slot
that addMode() overwrites, so the same mode object can't be shared
between the main parser and a sub-parser.

Three small additions:

Handler::reset() — clears calls, status, currentModeName, and
installs a fresh CallWriter. Lets one Handler instance be parsed
against repeatedly without state bleed.

Parser::getHandler() — accessor; sub-parser callers need it to
reach the handler for reset() and for harvesting the produced
call list.

ModeRegistry::getSubParser($excludeCategories, $excludeModes) —
returns a cached Parser preconfigured with every active mode
except those excluded. Mode objects are cloned before being
attached so connectTo()'s assignment to $Lexer does not clobber
the main parser's references. Cache key is the exclusion-set;
default exclusion is CATEGORY_BASEONLY (no Header inside the
sub-parsed content).

Tests cover Handler::reset's full clear, sub-parser caching,
default and custom exclusions, registry-reset propagation, and
the clone-not-share invariant for $Lexer.

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move handler methods into ParserMode classes and rename Handler

Each ParserMode class now implements handle() from ModeInterface,
containing the token handling logic that previously lived as individ

move handler methods into ParserMode classes and rename Handler

Each ParserMode class now implements handle() from ModeInterface,
containing the token handling logic that previously lived as individual
methods on Doku_Handler.

The Handler class (formerly Doku_Handler) is the single dispatch point:
Lexer passes tokens to Handler::handleToken() which routes to mode
objects, plugins, or returns false. The Lexer only tokenizes and
resolves mapHandler aliases.

Key changes:
- Add handle() to ModeInterface, implemented by all mode classes
- Move Doku_Handler to dokuwiki\Parsing\Handler namespace
- File extends Code (shared parsing via $type property)
- Quotes uses mapHandler() + Handler::getModeName() for sub-modes
- Media::parseMedia() replaces Doku_Handler_Parse_Media()
- Code::parseHighlightOptions() replaces parse_highlight_options()
- Per-parse state (footnote, doublequote) stays on Handler
- Deprecated wrappers kept for base/header/internallink/media
- Class alias and rector rules added for backward compatibility

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