p0 line landing: coord board/roll + wrapper usage contract + dispatch layer (successor to #1467) (#1468)

Co-authored-by: orch-01 <[email protected]>

packages/mosaic/framework/tools/git/test-issue-comment-usage-contract.sh

@@ -97,7 +97,7 @@ expect_rc() { # expect_rc <want> <desc> <args...>
 }
 
 expect_stderr() { # expect_stderr <pattern> <desc>
-    grep -q "$1" "$ERR_FILE" || fail "$desc: stderr missing '$1'"
+    grep -q "$1" "$ERR_FILE" || fail "$2: stderr missing '$1'"
 }
 
 # 1. Help exits 0 and prints usage on stdout.
@@ -124,6 +124,13 @@ for flag in -i -b -c -l --issue --body --comment --login; do
     expect_stderr "requires a value" "value-less $flag message on stderr"
 done
 
+# 4a. An option-like value is a MISSING value, not a value (codex PR #1464:
+# -b --help previously consumed --help as the body and performed the write).
+expect_rc 2 "option-like value rejected" -i 5 -b --help
+expect_rc 2 "short flag value rejected" -i 5 -b -h
+expect_stderr "requires a value" "short flag value message on stderr"
+expect_stderr "requires a value" "option-like value message on stderr"
+
 # 6. Alias acceptance at parse level: both -b and -c carry a value past
 # parsing; the wrapper then fails at platform detection (not a git repo)
 # nonzero but NOT as a usage error (rc must not be 2).