TraceRecord field `realtime` differs from documentation

Bug report

Expected behavior and actual behavior

In the Nextflow documentation realtime is described as

**realtime**
    Task execution time i.e. delta between completion and start timestamp.

I found that this is often not true and quite by a lot. See the following raw trace:

submit	duration	realtime	start	complete
1774271746328	16901	8000	1774271746424	1774271763229
1774271763256	35975	6000	1774271766533	1774271799231

Now you can subtract complete - start.
For the first line this is 1774271763229 - 1774271746424 = 16805. This does not correspond to realtime given at 8000 or exactly 8s.

While the correct value is initially set
https://github.com/nextflow-io/nextflow/blob/00f35b3a9f672c779c4d4baec14e877f27ee4bb7/modules/nextflow/src/main/groovy/nextflow/processor/TaskHandler.groovy#L239

it is replaced a few lines later
https://github.com/nextflow-io/nextflow/blob/00f35b3a9f672c779c4d4baec14e877f27ee4bb7/modules/nextflow/src/main/groovy/nextflow/processor/TaskHandler.groovy#L246

by this value
https://github.com/nextflow-io/nextflow/blob/9d65b9eead8887b7ba9a18050897aff58ef6fed7/modules/nextflow/src/main/resources/nextflow/executor/command-trace.txt#L206

Steps to reproduce the problem

Run nextflow run nf-core/demo -r 1.1.0 -profile test,docker and look at the execution_trace_<timestamp>.txt file's realtime vs complete - start value.

Environment

• Nextflow version: 25.10.4

Either the documentation is wrong and should be changed or the value should not be overwritten / a new walltime parameter introduced.

Start with the referenced lines in modules/nextflow/src/main/groovy/nextflow/processor/TaskHandler.groovy and the realtime entry in modules/nextflow/src/main/resources/nextflow/executor/command-trace.txt. Reproduce with nf-core/demo using the stated Docker profile, compare realtime with complete minus start, and determine whether the implementation or the documentation should define the final value. Done means the trace behavior and documentation agree, with coverage for the corrected interpretation.