Keep a one-letter or one-digit value instead of dropping it as a bullet

[kevin9327]

A value that is a single digit or letter disappears when it sits in a table cell of its own. The Wikipedia infobox for Barack Obama:

oc wiki article Barack_Obama, then oc read 17 --budget 60:

main:     [17] Michelle Robinson        branch:  [17] Michelle Robinson
          ( m. 1992 )                            ( m. 1992 )
          Children                               Children
          Parents                                2
          [18] Barack Obama Sr.                  Parents
                                                 [18] Barack Obama Sr.

The cause is the last pass of mergeText in src/distill.js, which drops every text block of one character so that list bullets and separators cost nothing. A cell is a block of its own, so a count, a grade, or a one-character CJK word in a cell went with them. The filter now drops a one-character block only when it is not a letter or a digit (/[\p{L}\p{N}]/u). Bullets, pipes, and middle dots are punctuation or symbols, so they still go.

Cost. No fixture page in tests/pages/ changes: same block count and same --stats tokens for all 28. On the live Obama article the page goes from 7,125 to 7,127 blocks (the 2 and one A), and the first render is ~433 tokens either way. Hacker News's front page is unchanged.

Test. tests/distill.test.js gains one test: an infobox-shaped table keeps 2, A, and 是 after their labels, and a list of | and • still drops them. On main it fails with ["Spouse","Michelle Robinson","Children","Grade","Available","Home","About"]. Full suite on Windows (Node 24): 316 tests, 313 pass, 3 skipped, 0 fail.

Left alone. A lone symbol that carries meaning in a feature table (✓, ✗) is still dropped, because the same class holds the arrows and stars pages use as decoration. No CHANGELOG line, to keep this round's PRs from conflicting there.

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