Refactor LinearVerbosity to use SciMLLogging's @verbosity_specifier macro

[ChrisRackauckas-Claude]

Summary

• Refactors LinearVerbosity to use SciMLLogging's @verbosity_specifier macro instead of manual struct definition and constructors
• Reduces code from ~314 lines to ~218 lines while maintaining identical functionality
• Bumps SciMLLogging minimum version to 1.7 (required for the macro)

Changes

src/verbosity.jl:

• Replace @concrete struct with SciMLLogging.@verbosity_specifier LinearVerbosity
• Remove manual keyword constructor (~60 lines)
• Remove manual preset constructors (~70 lines)
• Remove _resolve_arg_value helper function
• Keep backwards-compatible helper functions (option_group, group_options) and group classification constants

Project.toml:

• Bump SciMLLogging minimum version from 1.3.1 to 1.7

What the macro auto-generates

• Parametric struct LinearVerbosity{T1, T2, ...} for type stability
• Preset constructors: LinearVerbosity(None()), LinearVerbosity(Minimal()), etc.
• Keyword constructor with proper precedence: individual field > group > preset

Test plan

• LinearVerbosity Tests: 30/30 passed
• LinearVerbosity Logs Tests: 3/3 passed
• BLAS Return Code Interpretation: 23/23 passed
• OpenBLAS Verbosity Integration Tests: 5/5 passed
• CI tests

🤖 Generated with Claude Code

[ChrisRackauckas-Claude]

Fixed the ExplicitImports stale imports error. The @verbosity_specifier macro generates code that uses these SciMLLogging imports (AbstractVerbositySpecifier, AbstractMessageLevel, AbstractVerbosityPreset, None, Minimal, Standard, Detailed, All), but ExplicitImports can't detect usage through macro expansions. Added them to the ignore list in the QA tests.