validate: --strict silently ignored for GGUF/SafeTensors

[noahgift]

Bug

apr validate model.gguf --strict accepts the --strict flag but silently ignores it for non-APR formats (GGUF, SafeTensors).

Root Cause

In crates/apr-cli/src/commands/validate.rs, the dispatch at line 47 doesn't pass strict to the Rosetta validation path:

match format {
    FormatType::Apr => run_apr_validation(path, quality, strict, min_score, json),
    FormatType::Gguf | FormatType::SafeTensors => {
        run_rosetta_validation(path, format, quality, json)  // strict NOT passed
    }
}

The run_rosetta_validation() function signature (line 88) doesn't even accept strict.

Additionally, --strict is also unused in the APR path — print_summary() at line 348 has _strict: bool (underscore prefix = intentionally unused).

Expected Behavior

--strict should fail validation on warnings (NaN count > 0, all-zero tensors, etc.) instead of only failing on hard errors.

Fix

1. Add strict parameter to run_rosetta_validation()
2. When strict=true, fail if there are any NaN/Inf counts or all-zero tensors
3. Implement strict logic in APR path too (fail on warnings, not just failures)