docs: fix imprecise symbol-kind wording in audit log

Round 2 of the code-review cycle on PR #784 found that the
stagingHelperShellFunc nice-to-have entry called it "the function" —
it's a const string literal, not a function.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016AbFuwvqqq2fBiYWa3ubap

Author: claude

docs/development/architecture-audit.md

@@ -109,8 +109,8 @@ is now exported and `requiredstructure` calls it directly.
   coverage exists, only the naming convention drifts.
 - `stagingHelperShellFunc` (`internal/githooks/githooks.go`)
   contains "Helper" in its name — go.md flags this as a
-  smell, though the function is well-scoped. Rename on next
-  touch.
+  smell, though the constant is well-scoped. Rename on
+  next touch.
 - `Override.Patterns()` / `KindAssignmentEntry.Patterns()`
   (`internal/config/config.go`) are two-line branching
   methods exercised only inside larger config tests, not by