benches: package as kernbench.benches, add @bench registry + list subcommand

Move benches/ -> src/kernbench/benches/ and src/kernbench/cli/probe.py ->
src/kernbench/probes/probe.py. Each bench self-registers via
@bench(name=..., description=...); kernbench list enumerates benches
with auto-assigned indices, --bench accepts kebab-case name or numeric
index. Audit at package-import time fails if any non-underscore module
forgets the decorator. ADR-0010 (EN + KO) updated to reflect the new
resolver path, list subcommand, and probes package separation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/kernbench/benches/__init__.py

@@ -0,0 +1,9 @@
+"""kernbench.benches: eager-import sibling modules so @bench fires.
+
+Underscore-prefixed modules are treated as helpers and skipped.
+After import, every imported module must have registered at least one
+bench, or a RuntimeError is raised by the audit.
+"""
+from kernbench.benches.registry import _eager_import_and_audit
+
+_eager_import_and_audit(__path__, __name__)