src/offline/cable_driver_common.F90: Override cable_user%YearStart to syear for default MetType case

[SeanBryan51]

This change allows cable_user%YearStart to always be the final truth about the start point of the simulation for the default MetType case, consistent with other CABLE configurations.

This change is required to bring in the new parallel I/O output module (#655).

Type of change

• Refactor

Testing

• Are the changes bitwise-compatible with the main branch? If working on an optional feature, are the results bitwise-compatible when this feature is off? If yes, copy benchcab output showing successful completion of the bitwise compatibility tests or equivalent results below this line.

2026-03-13 14:01:41,628 - INFO - benchcab.benchcab.py:380 - Running comparison tasks...
2026-03-13 14:01:41,653 - INFO - benchcab.benchcab.py:381 - tasks: 168 (models: 2, sites: 42, science configurations: 4)
2026-03-13 14:04:20,619 - INFO - benchcab.benchcab.py:391 - 0 failed, 168 passed

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📚 Documentation preview 📚: https://cable--709.org.readthedocs.build/en/709/

[Whyborn]

I don't really like fudging the cable_user%YearEnd, but it seems the way that the site runs set kend makes this unavoidable for now right? If you can think of a good way to not fudge this for now, that would be great, but I can't come up with anything. Happy for it to be merged if you can't think of anything now.

[SeanBryan51]

Another way could be to add the statement IF (cable_user%MetType == '') EXIT at the end of the year do loop. I think this should have the same effect

[Whyborn]

The cable_user%YearEnd would not be set to something meaningful in that instance right? To give it something meaningful, it would have to be modified in the site meteorology reading routine. That whole bit of code should disappear sometime in the next year, so it's probably not worth the time. Given there's not a quick fix way to set YearEnd properly, I reckon just merge it in as is.

[SeanBryan51]

Sounds good to me. Thanks Lachlan. I'll go ahead and merge as is.