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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add tests pinning blank-line tolerance in GFM listblock

rename syntax flavors 'dokuwiki' / 'markdown' to 'dw' / 'md'

Symmetry with the existing 'dw+md' / 'md+dw' setting values.

replace DW Quote with unified GfmQuote

GfmQuote covers blockquote parsing for both DokuWiki and GFM dialects
in a single mode. Same quote_open/quote_close handler instructions; a
DW-preferred post-p

replace DW Quote with unified GfmQuote

GfmQuote covers blockquote parsing for both DokuWiki and GFM dialects
in a single mode. Same quote_open/quote_close handler instructions; a
DW-preferred post-pass flattens sub-parsed paragraph wrapping into
linebreak calls so existing pages keep their <br/>-between-lines
rendering. MD-preferred keeps the <p>-wrapped spec shape.

Block content (lists, fenced code, tables) inside `>` quotes now
renders, since the body is sub-parsed. Headers stay excluded
(BASEONLY) — TOC and section-edit anchors don't compose with
<blockquote>, same rationale as GfmListblock.

Convert ModeRegistry's sub-parser cache into an acquire/release pool
to support same-key re-entrancy: a list inside a quote re-enters
gfm_quote during the list-item sub-parse, and the inner call needs
its own parser instance even though the exclusion key matches.
GfmListblock is updated to use the new acquire/release primitives.

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add listo_open_start sibling method for GFM start numbers

Reverts the listo_open signature widening from 5a2118acc and instead
adds a sibling method `listo_open_start($start = 1)` on the renderer
hi

add listo_open_start sibling method for GFM start numbers

Reverts the listo_open signature widening from 5a2118acc and instead
adds a sibling method `listo_open_start($start = 1)` on the renderer
hierarchy. The base default delegates to listo_open() so renderers
that don't override it still produce a valid (but unnumbered) list;
xhtml's override emits <ol start="N">.

The handler now emits 'listo_open_start' only for ordered lists with
a non-default first number; plain ordered lists keep emitting the
unchanged 'listo_open' instruction. This preserves the historical
listo_open / listu_open signatures (zero-arg base, $classes-only
xhtml form from 2016) so the 17 plugin renderers found via
codesearch keep working without modification, while still
implementing GFM's "5. foo" -> <ol start="5"> rule.

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add GfmListblock for GFM lists

GfmListblock captures an entire list block atomically with one
addSpecialPattern match, then walks the captured text in handle()
grouping lines into items. Each item's

add GfmListblock for GFM lists

GfmListblock captures an entire list block atomically with one
addSpecialPattern match, then walks the captured text in handle()
grouping lines into items. Each item's body is dedented to its
content column and parsed by ModeRegistry::getSubParser() so
block content (paragraphs, fenced code, blockquotes, plugin
blocks) works inside items uniformly. Sub-parsed calls are wrapped
in a Nest call before they reach the outer handler, matching the
Footnote pattern: the main handler's Block rewriter treats nest
as opaque and the renderer base class unwraps it transparently,
so multi-paragraph items don't get double-wrapped in <p>.

Marker syntax: -, *, + (unordered) or 1-9 digits followed by
. or ) (ordered). Indentation is a 2-space-multiple step starting
at 0; depth = (indent / 2) + 1, odd indents round down, tabs become
two spaces. The first ordered item's number drives the start
attribute on <ol> via the listo_open $start parameter.

GfmLists subclasses AbstractListsRewriter with the GFM marker
parser; the state machine on the base class is shared with DW Lists.

GfmListblock loads only when $conf['syntax'] is markdown or md+dw.
Under those settings the DW Listblock is suppressed because the two
list models conflict — DW's mandatory 2-space indent rule vs GFM's
zero-indent top-level rule, and -/*/+ markers shared. Plugins that
relied on Listblock loading under md+dw will see it absent there.

Sub-parser exclusion set: CATEGORY_BASEONLY (no Header inside list
items) and gfm_listblock itself (defensive guard against re-entry
on pathological inputs; nested lists are handled by the outer
pattern, not by re-entry).

Tests cover marker variants, ordered start numbers, nested lists at
two and three levels, inline formatting inside items, marker-
character switches keeping one list, type switches splitting the
list, fenced code inside items, multi-paragraph (loose) items, and
two regressions on blank-line tolerance inside the captured block.
SpecCompatRenderer learns to render the list call sequence, and
spec.txt tests for digit/marker-width/lazy-continuation behavior
that GfmListblock deliberately doesn't implement are documented in
gfm-spec/skip.php with the per-bucket reasons (A-F).

Drops two now-obsolete entries from skip.php (image escapes that
land via earlier GfmLink/GfmMedia work) and inlines the Setext
explanation that previously pointed at SPEC.md. Replaces the
SPEC.md reference in GfmEmphasisTest with the inline reason.

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