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11 new SX primitives in sx_primitives.ml wrapping Unix.openfile/read/write/ lseek/set_nonblock: channel-open/close/read/read-line/write/flush/seek/tell/ eof?/blocking?/set-blocking!. Tcl runtime now uses real channel ops: - open ?-mode? returns "fileN" handle (modes r/w/a/r+/w+/a+) - close/read/gets/puts/seek/tell/eof/flush wired through - new fconfigure command supports -blocking 0|1 - puts dispatches to channel-write when first arg starts with "file" - gets command registration fixed (was pointing to old stub) eof-returns-1 coro test updated to match real Tcl semantics (eof flips only after a read hits EOF). Test runner timeout bumped 180s→1200s (post-merge JIT is slow). +7 idiom tests covering write+read, gets-loop, seek/tell, eof-after-read, append mode, seek-to-end, fconfigure-blocking. 349/349 green. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>