Let the model keep supplying the CLI defaults

[sjoelund]

The CLI gained the C++ flag names in #1631, but also gained an argparse default for each of them. Those defaults are applied unconditionally, so they override the values the model itself provides:

flag	C++ CLI	after #1631
--startTime	DefaultExperiment	always 0.0
--stopTime	DefaultExperiment	always 1.0
--tolerance	DefaultExperiment	always 1e-4
--stepSize	DefaultExperiment	always 1e-3
--resultFile	<modelName>_res.mat	default_res.mat
--mode	the FMU's preference	always me

oms_extractFMIKind only overrode a DefaultExperiment value when the corresponding flag was explicitlySet, and SimulateSingleFMU only called oms_setResultFile when --resultFile was not <default>. Restore that: every option whose fallback lives in the model or in Flags.h now defaults to None, and the documented default moves into the help text so --help still shows it.

Two more flags could not do what they said:

• --clearAllOptions is re_void, so the =true the forwarding loop appended made the native parser reject it.
• --suppressPath was overridden by FMU.instantiate(), which set it unconditionally. That also warned "Flag --suppressPath is set multiple times" whenever the flag was passed. Both call sites now go through Capi.setSuppressPath(), where the first caller wins.

Forwarded arguments are quoted as a whole rather than bare, since the native tokenizer is std::quoted and a value with spaces otherwise splits across tokens.

Finally, install the launcher 0755. It inherited the 0700 of the OMSimulatorPython3 helper it replaced, which leaves bin/OMSimulator unusable by anyone but the installing user.

Assisted-by: Claude Opus 5 (1M context)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.24%. Comparing base (62c758f) to head (e06e629).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1637   +/-   ##
=======================================
  Coverage   29.24%   29.24%           
=======================================
  Files          68       68           
  Lines       12960    12960           
  Branches     8389     8389           
=======================================
  Hits         3790     3790           
  Misses       7979     7979           
  Partials     1191     1191           

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