[jcwal1516]

Full validation exposed three gaps: native tests did not compile without default features, the spelling checker treated guard digests as words, and a Linux test runner exhausted its disk.

• Make the capacity-error helper and packet counters available to all test builds. Count parsed headers in reduced-feature tests too, preserving the packet-selection assertions.
• Ignore only the ok: field followed by a 16-digit hexadecimal digest. Baseline prose remains checked, and ordinary misspellings still fail.
• Omit debug symbols from the full test matrix and use a separate cache for that configuration to reduce hosted-runner disk use. Test coverage and debug assertions are unchanged.

Validation: reproduced the three reduced-feature compile errors, then passed the existing packet-selection regression and the affected native Miri step (8 tests, installed nightly-2026-08-13). Both baseline files pass the spelling check; a control confirms text outside the digest remains checked. The 55 CI-planner/verifier tests, native library/test Clippy, formatting, whitespace checks and workflow YAML parsing pass. The post-merge Full validation run passed, including Miri on the CI nightly, the spelling check, every test-matrix lane, and the final aggregate.

The shared native files with prior jcoyne contributions are crates/j2k-native/src/j2c/mod.rs, crates/j2k-native/src/j2c/decode.rs and crates/j2k-native/src/j2c/segment.rs. Their changes are test configuration and counters; the #133 ring depths, error replay, band release and executor design remain unchanged.

The original failing run is Full validation. Exact-head CUDA and Metal quick validation passed.