fix(flycheck): correct abbrev-mode no-arg toggle in cj/prose-helpers-on

The shape (if (not (abbrev-mode)) (abbrev-mode)) calls abbrev-mode with
no argument -- that's the toggle signature, not a query. When the mode
was already on the function flipped it off then on instead of being a
no-op. Replaced with (unless (bound-and-true-p VAR) (MODE 1)) for both
abbrev-mode and flycheck-mode. 4 ERT tests cover both-off, both-on, and
the two mixed states.

Also ran the module hardening pass across 24 newly-added modules,
renamed the six completed Review sub-tasks to Harden, filed 11 new
findings under their Harden parents, and broke three design specs
(EMMS-free music, dev F-keys, dev-setup-project) into 20
dependency-ordered sub-tasks via parallel subagents. Verified the
sqlite finalizer bug from 2026-04-26 is gone and closed its tracking
entry.

0 files changed, 0 insertions, 0 deletions