chore(tasks): mark p9-fb-18 completed

PR #82 머지 (cce2fbc). 머지 후 spec status 갱신.

--repl flag 는 spec 명시이나 stdin loop fixture 부담으로 deferral —
별 후속 task 또는 사용자 회신 후 결정.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tasks/p9/p9-fb-18-cli-ask-session-repl.md

@@ -3,7 +3,7 @@ phase: P9
 component: kebab-cli + kebab-app
 task_id: p9-fb-18
 title: "CLI ask --session / --repl"
-status: in_progress
+status: completed
 depends_on: [p9-fb-15, p9-fb-17]
 unblocks: []
 contract_source: ../../docs/superpowers/specs/2026-04-27-kebab-final-form-design.md