[abashev]

google/MOE, the tool whose <!-- MOE:begin_intracomment_strip --> and <!-- MOE:end_intracomment_strip --> markers the javadoc formatter recognised, has been dead for years; #150 drops the line-comment rule for // MOE:. This removes the javadoc side: the two token types, the lexer patterns, the formatter cases and the writer state that queued a begin marker until the next token and remembered its indent for the end marker. Both markers now take the ordinary HTML comment path: a line of their own, at the indent of the text around them. Once #150 is in as well, no MOE reference is left in src/main.

What changes for a javadoc that still carries the markers:

• A blank line that the tag after a begin marker asks for comes after the marker, not before it.
• A marker inside or between footer tags is a continuation line of the tag it follows, so it is indented four columns; the old code wrote the begin marker at the indent of the next token and gave the end marker that same indent.
• A begin marker that closes the comment without an end marker is kept; the old code queued it and never flushed it, so /** Foo. <!-- MOE:begin_intracomment_strip --> */ came out as /** Foo. */.

Before, for the footer tags of the test:

 * @param user the person to teleport.
 *     <!-- MOE:begin_intracomment_strip -->
 *     Users must sign go/deatomize-waiver ahead of time.
 *     <!-- MOE:end_intracomment_strip -->
 * <!-- MOE:begin_intracomment_strip -->
 * @deprecated Sometimes turns the user into a goat.
 * <!-- MOE:end_intracomment_strip -->

After:

 * @param user the person to teleport.
 *     <!-- MOE:begin_intracomment_strip -->
 *     Users must sign go/deatomize-waiver ahead of time.
 *     <!-- MOE:end_intracomment_strip -->
 *     <!-- MOE:begin_intracomment_strip -->
 * @deprecated Sometimes turns the user into a goat.
 *     <!-- MOE:end_intracomment_strip -->

Tests

Written first: moeStripMarkersAreOrdinaryHtmlComments failed before the change, with the old layout as its actual output. The three cases that only guarded the begin/end pairing against exploding (moeCommentBeginOnlyInMiddleOfDoc, moeCommentBeginOnlyAtEndOfDoc, moeCommentEndOnly) are gone.

Verification

• ./gradlew test over all modules is green; ./gradlew formatDiff changes nothing; a full recompile gives the same 119 javac warnings before and after.
• JDK 21 corpus, 15,747 files, formatted with javadoc formatting on: no file differs between 21.X.X and this branch, and the JDK carries no MOE marker. The CLI never enables javadoc formatting (JavaFormatterOptions defaults it off and Main has no flag for it), so the usual -i run cannot see a javadoc change; the comparison ran through Formatter with formatJavadoc(true) plus the CLI's import and reflow passes.