replace DW Hr with unified GfmHr

Single mode covers both DokuWiki (4+ dashes) and GFM (3+ of -/*/_)
horizontal rules; pattern self-narrows on $conf['syntax']. Always
loaded across all four syntax se

replace DW Hr with unified GfmHr

Single mode covers both DokuWiki (4+ dashes) and GFM (3+ of -/*/_)
horizontal rules; pattern self-narrows on $conf['syntax']. Always
loaded across all four syntax settings, mirroring the GfmQuote
replacement pattern. Same `hr` handler call so renderers and the
call API are unchanged.

Drops DW's old [ \t]* leading-whitespace tolerance — inert in
practice past 0-1 spaces (Preformatted at sort 20 intercepts
everything ≥ 2 spaces or any tab).

Spec examples 13, 20, 26-28, 224 turn green; 17, 21-24, 29, 30, 31
go to skip.php as deliberate non-implementations (whitespace
tolerance and list-precedence cases).

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migrate parser tests to modern namespaced classes

Move old-style parser tests from _test/tests/inc/parser/ to namespaced
test classes under _test/tests/Parsing/ParserMode/ and
_test/tests/Parsing/Le

migrate parser tests to modern namespaced classes

Move old-style parser tests from _test/tests/inc/parser/ to namespaced
test classes under _test/tests/Parsing/ParserMode/ and
_test/tests/Parsing/Lexer/.

- Add ParserTestBase with assertCalls() helper for comparing handler
call sequences with byte index stripping
- Split lexer.test.php into ParallelRegexTest, StateStackTest, and
LexerTest with a RecordingHandler that extends Handler
- Merge handler_parse_highlight_options tests into CodeTest
- Add new tests for previously untested modes: Nocache, Notoc, Rss,
and all individual formatting modes (Strong, Emphasis, etc.)
- Modernize test code: [] syntax, lowercase null, correct assertEquals
argument order, replace deprecated withConsecutive and string callables
- Renderer tests remain in old location (renderers not yet migrated)

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