The README listed 11 of fold's 17 detectors, never explained the
confidence tiers every finding carries, did not mention the new exit
code 2 / coverage reporting, and spent half its length on a
performance roadmap.
It now says what fold is, defines the five tiers (from
include/fold/report/finding.hpp, including concrete-witness and
latent), what "bounded" means after the loop-exit fix, a quick start,
output formats and exit codes (0 none, 1 any unsuppressed finding, 2
unwritable report or any unanalysed translation unit), and links. The
detector list defers to the complete table in docs/USAGE.md.
The performance section moves to docs/architecture/performance.md, with
one correction: the gold set was derived from fold's own reviewed output
and is matched by detector kind and file, so it catches drift rather
than measuring precision/recall independently. The lint pre-commit hook
note moves to BUILD.md.
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