refactor: clap CLI parser, safety docs, dead code docs, cross-refs
Audit items 6, 8, 9, 10:
#6 - Relay CLI: replaced 154-line manual parse_args() with clap derive
(13 flags/options preserved, auto --help, --version from build hash)
#8 - wzp-native: added # Safety docs to all 3 unsafe extern "C" fns
#9 - wzp-crypto: documented x25519_static_secret/public as reserved for
future static-key federation auth (not dead code, intentionally unused)
#10 - Cross-references between quality.rs ↔ dred_tuner.rs module docs
368 tests passing, 0 regressions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
81b5522942