Brummel
3e8fd73f68
Resolves the four non-bug findings from the inferential-validation milestone
fieldtest (the bug — the broken-pipe panic — is fixed in 1088320):
- [friction] generalize refusals now carry a reason instead of a bare usage dump:
<2 instruments, a multi-value candidate flag, a missing knob, a duplicate
symbol, and a non-stage1-r strategy each get a one-line why (mirroring the
R-only metric refusal). Two parser tests strengthened to pin the message.
- [friction] --select <argmax|plateau:mean|plateau:worst> added to the
walkforward branch of the global USAGE (aura --help) — the plateau objective
was undiscoverable from the only help the CLI prints (the per-subcommand usage
already carried it).
- [spec_gap] C1 gains a scope note: bit-identity is per-run; a derived metric
recomputed by two different command paths may differ by floating-point
reassociation (<=1 ULP), which is not a C1 violation — ratifies the
fieldtester's reading of the sweep-vs-generalize sqn difference.
- [spec_gap] the milestone vocabulary is added to docs/glossary.md:
cross-instrument generalization, deflated score, overfit probability,
neighbourhood score, plateau selection, sign-agreement, worst-case floor.
The fieldtest triage spec (docs/specs/fieldtest-*) is removed now its findings
are resolved; the tracked fieldtests/ scenario corpus stays.
Verified: cargo test --workspace green (0 failed), clippy --workspace
--all-targets -D warnings clean; `aura --help` shows --select; the refusals
print their reason.
refs #146