Work package E05: Full-precision output

Branch: wp/E05-full-precision
Status: ready for review

Done

• step 1/3: C++ option FlatFile::set_full_precision(bool) (also on Analyzer), writing {:.17g} for properties with the default double format and for x positions; JSON metadata key "precision": "%.17g"; tests flatfile_full_precision, analyzer_full_precision in tests/cpp/logger/test_flatfile.cpp
• step 2/3: Python property full_precision (read/write) on FlatFile and Analyzer, stubs, tests test_full_precision and test_flatfile_full_precision in tests/python/test_logger.py (15 passed, run from a temp dir against .venv build)
• step 3/3: CHANGELOG entry under ## Unreleased

Next step

Nothing; review and merge (E02 and E03 also add ## Unreleased to CHANGELOG.md: expected conflict).

Decisions

• The default stays {:.10f} in this package. The option is off by default.
• Applies to properties whose format equals DEFAULT_DOUBLE_FORMAT, and to the x columns. Properties with an explicit format (evaluations {:d}, user formats) keep it. Python subclasses overriding call_to_string are bypassed for default-format properties when the option is on (FlatFile reads the value through operator()).
• Old .info files (v1 analyzer) still use {:g} for best y; not changed.
• JSON metadata: key "precision": "%.17g" is written only with the option on. Absence means the legacy %.10f. Old readers ignore unknown keys.
• How to flip the default later: change the full_precision_ initialiser in flatfile.hpp to true (and keep the setter for opting out), in a release that announces it in the changelog, once iohinspector and IOHanalyzer readers are known to read the longer values. Then also write the "precision" key always ("%.10f" for the legacy mode).
• Set the option before the first problem is attached (JSON metadata is created then).

Open questions / Blocked

• none

Work package from the IOHanalyzer rebuild plan (plan/ in IOHprofiler/ioh-web). Review and merge are done by a person.

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