docs/cr3.md gains a variant-status table: every supported and rejected CRX
coding variant, the function that gates it and the exact Unsupported text.
crates/raw/tests/cr3_variants.rs enforces the rejections (19 tests). Each
rejected variant is rebuilt as a small synthetic CR3 (container, CMP1
descriptor, CRX stream) and the test asserts the exact string, and that
probe_info (the import path) and decode return the same error. Control
fixtures decode through the same container, including both edges of the
accepted uniform quantization range (4..=44) and adaptive QP range
(131..=168), so a rejection can only come from the documented gate. The
table itself is prose and is not checked against the tests.
The doc said only QP values 131-167 were accepted; the decoder also accepts
168 (quantization value 44, step 102), so that sentence now says so.
Tests and docs only; no decoder change.
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