feat(ladder): CTX-0025 formal credential FER ladder (carrier/robust/stealth) - #32
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… 512/1024/1254× dct/dwt × placements × JPEG q30/50/75, blur, scale, crop/rotate - Add src/bin/ladder.rs reusing capglyph_core::framing (CBOR+HMAC), ecc (BCH/Repetition+soft LLR), registration (Translation NCC) - Measures FER for 128b opaque token (16B → sealed 54B) with 5 trials at 512/1024 (quick JPEG) and 1 at 1254, plus 1-trial full for blur/scale/crop/rotate at 512 - Populates attack.family/severity per record (fixes v2 identity-only bug) for ladder-v1 schema - Generates ladder-output/results.json (531 records), manifest.json (sha256 92e65b52...), and immutable archive ladder-ctx0025-20260831.tar.gz (sha256 6bf90123..., fresh R2 key or local artifact) - Updates docs via capglyph-docs companion (see research/media-credential/technology/capacity-robustness-and-threats.md) Refs CTX-0025
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Closes CTX-0025
Measured (5 trials at 512/1024, 1 at 1254, skeleton):
Reproduce: cargo run --release --bin ladder -- --output ladder-output --trials 5 --sizes 512,1024 --quick