[serpentblade]

Summary

Two commits, each separable (each passes the full suite on its own):

1. fix: emit w:lineRule from ParagraphStyle::$lineSpacingRule: the writer wrote w:lineRule="exact" for every line spacing. It now writes auto, exact or atLeast as the style says. An unset or unknown rule still writes exact.
2. fix: emit w:caps and w:smallCaps for RunStyle: RunStyle::$allCaps and $smallCaps were never written to DOCX.

No API changes. Both are model fields that already existed and that the reader already fills in; only the writer ignored them.

Motivation

Both show up on a plain read → write round-trip through the library itself:

• Line spacing. OoxmlPropertyParser stores the rule next to w:line (auto when the attribute is missing, the schema default), and the HTML serializer already treats a missing rule as auto. The writer was the one place that ignored it. Word's default 1.15 spacing (<w:spacing w:line="276" w:lineRule="auto"/>) came back as w:line="276" w:lineRule="exact", a fixed 13.8 pt line height, so any text larger than about 11 pt was clipped at the top.
• Caps. The reader parses <w:caps/>/<w:smallCaps/> and the serializer writes text-transform: uppercase / font-variant: small-caps, but a heading set in small caps came back from read → write in plain lowercase.

Notes

• Default kept: lineSpacingRule = null writes exact, as before. DocumentBuilder's spacing(line: ...) and the HTML converter's line-height (both set only lineSpacingTwips) produce the same bytes as today.
• <w:caps/> and <w:smallCaps/> go after i/iCs and before strike, their position in EG_RPrBase.
• w:rPr order: the existing order (u before strike, vertAlign before color) does not match the order EG_RPrBase lists its elements in, but the Transitional schema in scripts/conformance declares EG_RPrBase as an unbounded xsd:choice, so any order validates. I left it alone. Happy to send a reorder separately if you'd like it to match the Strict ordering.
• A sample using the new output (auto and atLeast spacing; bold, italic, caps, small caps, strike in one run) passes scripts/conformance/xsd-check.sh.
• Not included: style-level (styles.xml) line spacing and caps. StylesXmlBuilder writes neither yet; that is a separate change. The HTML converter also does not parse text-transform/font-variant back into RunStyle.

Tests

composer install && vendor/bin/phpunit: OK (408 tests, 1027 assertions); before: OK (398 tests, 1009 assertions). After each commit: 405, 408, all OK. composer stan: no errors.

• tests/Writer/LineSpacingRuleTest.php: each rule is written as given, unset/unknown write exact, and a DOCX with line="276" lineRule="auto" (and with no lineRule) comes back from read → write as auto. The round-trip cases fail on main.
• tests/Writer/CapsTest.php: emission, position after iCs and before strike, and write → read.

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