Complete modernization steps 2.3C and 2.3D

[egull]

Summary

• return a failure status for command errors and report standard exceptions with e.what()
• accept the documented half-lorentzian spelling and correct the grid help text
• add a reproducible bootstrap SEED parameter, defaulting to 0, with regression coverage
• apply the time-bosonic zero-frequency limit only at exactly zero frequency
• keep logarithmic-grid calculations in double precision
• retain JacobiSVD after benchmarking BDCSVD and finding no speedup

Validation

• 41/41 Release unit tests pass
• complete fast regression suite passes
• complete full regression suite passes
• Debug warnings-as-errors build passes
• bootstrap output is identical across independent runs with the default seed

[Copilot]

Copilot review overview

🟡 Changes recommended

Unknown Maxent exceptions can currently be recorded as passing regression cases.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 2

Open (2)

• Catch-all diagnostic breaks Maxent failure classification · New
• Unknown exception exit can be misclassified as regression success · New

What changed in this PR

This PR modernizes Maxent CLI behavior, bootstrap reproducibility, grid handling, numerical edge cases, and regression coverage.

Changes:

• Adds deterministic bootstrap seeding and updated regression references.
• Corrects grid aliases, help text, zero-frequency handling, and log-grid precision.
• Improves exception status handling and expands documentation and tests.
• Regression classification still needs to record unknown Maxent failures correctly.

File	Description
test/​regression/​REFERENCE_CHANGES.md	Records updated regression references.
test/​regression/​README.md	Documents deterministic bootstrap output.
test/​regression/​PROVENANCE.md	Records bootstrap and kernel provenance.
test/​regression/​manifest.py	Updates generated manifest rules.
test/​regression/​MANIFEST.md	Updates the case inventory.
test/​regression/​make_inputs.py	Generates bootstrap test inputs.
test/​regression/​inputs/​t_grid_half_lorentzian/​case.param	Uses the hyphenated grid alias.
test/​regression/​inputs/​t_generate_err/​data.dat	Adds bootstrap input data.
test/​regression/​inputs/​t_generate_err/​case.param	Adds bootstrap case parameters.
test/​regression/​generate.py	Packs bootstrap output and classifies run statuses.
test/​regression/​components/​dump_components.cpp	Adds symmetric kernel coverage.
test/​regression/​cases.py	Registers updated regression cases.
test/​gridTest.cpp	Tests the grid alias.
src/​maxent.hpp	Stores the bootstrap seed.
src/​maxent.cpp	Adds exception handling and corrected help text.
src/​maxent_simulation.cpp	Defines the SEED parameter.
src/​maxent_kernel.cpp	Applies the precise zero-frequency limit.
src/​maxent_helper.cpp	Uses the configured bootstrap seed.
src/​maxent_grid.cpp	Supports the alias and preserves double precision.
ALPS3_MIGRATION_PLAN.md	Marks modernization steps complete.

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[Copilot]

Copilot review overview

🔵 Needs a closer look

Strengthen non-default seed coverage, correct provenance counts, and require the expected exception signature in regression classification.

Review effort: Lite
Findings: None

Resolved since last review (2)

• Unknown exception exit can be misclassified as regression success
• Catch-all diagnostic breaks Maxent failure classification

[Copilot]

Copilot review overview

🔵 Needs a closer look

Three moderate regression-validation issues remain unresolved.

Review effort: Lite
Findings: None

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved blocking issues are recorded, and the supplied validation passes.

Review effort: Lite
Findings: None