Hojun-Cho
34101508be
Pure file-boundary move of lib/bufio/bufio.ww along its three banner seams: buffered stream + vtable callbacks -> stream.ww (per ref/hare/bufio/stream.ha), scanner + BUFSZ + overflow -> scanner.ww (per ref/hare/bufio/scanner.ha). Head defs split by ownership: flushdefault + rtabort (unread's assert) stay with stream, BUFSZ (scanner.ha:11) + overflow with scanner. The module head comment stays with stream.ww. No code, name, signature, or behavior change; the three banner lines are deleted (file names carry them) and three comment self-citations re-point (bufio.ww:87-89 -> stream.ww:73-75, bufio.ww:46-50 -> stream.ww:46-50, bufio.ww:77 -> scanner.ww:15), plus the lib/regex/regex.ww:1117 citation of lib/bufio/bufio.ww now names scanner.ww. import bufio resolves by directory (cmd/ww locate_import dir pass), so no consumer path lists change; bufio_test.ww is untouched (its split is blocked by the shared putstr helper vs the composed-mode duplicate-symbol reject; reported upstream). Validation: out/bin/ww test -I lib/ww lib/bufio/bufio_test.ww (26 passed) and out/bin/ww test lib/bufio (ok, external) both green; lib/regex/regex_test.ww (bufio importer) 33 passed.