docs(gates): cite the reachable squash commit for the exit-2 split

a8cd5e8 was squashed into 598a7c3 (#129) and is reachable from no
branch, so the comments now cite the commit that exists on main.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

scripts/skill-size-check.sh

@@ -118,7 +118,7 @@ FAIL=0
 # silently disabled the whole ADR-0020 gate family while every hook reported
 # green.
 #
-# Exit 2, not 1, for the same reason a8cd5e8 split validate-adapter.sh's usage
+# Exit 2, not 1, for the same reason 598a7c3 split validate-adapter.sh's usage
 # exits out: {0,1} are this script's verdict codes (clean / findings), and a
 # caller that reads a non-zero exit as "the SKILL.md needs editing" must be able
 # to tell a broken invocation from a real finding.

tests/test-skill-size-check.sh

@@ -734,7 +734,7 @@ expect_gate "a fixture with no authoring root reports DID NOT RUN and exits 0" \
 # The script used to print nothing and exit 0 when handed no paths, which made
 # a mis-scoped `files:` pattern indistinguishable from a corpus with no
 # findings — the whole ADR-0020 gate family silently disabled while every hook
-# reported green. Exit 2 (not 1) is the same split a8cd5e8 made in
+# reported green. Exit 2 (not 1) is the same split 598a7c3 made in
 # provider-adapter-author's validate-adapter.sh and the one vale-wrap.sh already
 # used: {0,1} are verdicts, 2 is "you invoked this wrong".
 #