cmd/bd: teach bd prime to use --claim

cmd/bd/prime.go

@@ -442,7 +442,7 @@ git push                    # Push to remote
 ### Creating & Updating
 - ` + "`bd create --title=\"Summary of this issue\" --description=\"Why this issue exists and what needs to be done\" --type=task|bug|feature --priority=2`" + ` - New issue
   - Priority: 0-4 or P0-P4 (0=critical, 2=medium, 4=backlog). NOT "high"/"medium"/"low"
-- ` + "`bd update <id> --status=in_progress`" + ` - Claim work
+- ` + "`bd update <id> --claim`" + ` - Claim work
 - ` + "`bd update <id> --assignee=username`" + ` - Assign to someone
 - ` + "`bd update <id> --title/--description/--notes/--design`" + ` - Update fields inline
 - ` + "`bd close <id>`" + ` - Mark complete
@@ -468,7 +468,7 @@ git push                    # Push to remote
 ` + "```bash" + `
 bd ready           # Find available work
 bd show <id>       # Review issue details
-bd update <id> --status=in_progress  # Claim it
+bd update <id> --claim  # Claim it
 ` + "```" + `
 
 ` + completingWorkflow + `

cmd/bd/prime_test.go

@@ -156,6 +156,24 @@ func TestOutputContextFunction(t *testing.T) {
 	}
 }
 
+func TestPrimeClaimGuidanceUsesAtomicClaim(t *testing.T) {
+	defer stubIsEphemeralBranch(false)()
+	defer stubPrimeHasGitRemote(true)()
+
+	var buf bytes.Buffer
+	if err := outputPrimeContext(&buf, false, false); err != nil {
+		t.Fatalf("outputPrimeContext failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "bd update <id> --claim") {
+		t.Fatal("prime output should teach bd update <id> --claim")
+	}
+	if strings.Contains(output, "bd update <id> --status=in_progress") {
+		t.Fatal("prime output should not teach bd update <id> --status=in_progress")
+	}
+}
+
 // stubIsEphemeralBranch temporarily replaces isEphemeralBranch
 // with a stub returning returnValue.
 //