refactor(build): build the IP-clearance row with the kotlinx.html DSL

[adityamparikh]

Depends on #245. This branch is stacked on it, so the first commit in the diff is #245's; review only the last commit, refactor(build): build the IP-clearance row with the kotlinx.html DSL. The extra commit drops out once #245 merges.

Summary

Builds the Incubator IP-clearance row (generateIpClearanceLicenseReport) with the type-safe kotlinx.html DSL instead of XMLStreamWriter plus whitespace string literals.

Before, the element structure was buried in literals like "\n ", so the shape of the emitted XML could only be recovered by replaying the whitespace. Now the code mirrors the XML:

appendHTML(prettyPrint = true).tr {
    td { +date.get() }
    td {
        +CHECKLIST_WORDING
        code { +"META-INF/LICENSE" }
        +" of the executable JAR):"
        ul { items.forEach { (name, licenses) -> li { +"$name — ${licenses.joinToString(" / ") { it.label }}" } } }
    }
}

• The checklist wording and the row indent move into named constants (CHECKLIST_WORDING, ROW_INDENT); one prependIndent replaces the hand-written indentation.
• The library escapes text itself.
• New buildSrc-only dependency: org.jetbrains.kotlinx:kotlinx-html-jvm:0.12.0 (Apache-2.0). It is not on the shipped classpath, so it does not appear in the binary LICENSE.

Output

The date, the checklist wording and all 157 dependency entries are unchanged. Only insignificant whitespace in the row differs: the checklist sentence is one line instead of hand-wrapped, and the <li> indent is 18 spaces instead of 20.

Testing

• ./gradlew build (JDK 25, clean tree, including rat) — 421 tests, 0 failed, 0 skipped.
• The generated ip-clearance-licenses.xml is well-formed; parsed, it matches the previous output (date, prose, 157 items). LICENSE is byte-identical.

@epugh, please review.

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