chore(p9-fb-06): sync Cargo.lock for tempfile dev-dep + flip spec to completed

Two follow-ups after PR #49 (kebab reset) merged:
- Cargo.lock: kebab-cli's new dev-dep `tempfile` was committed in the
  feature PR but the lockfile entry was not regenerated, leaving main
  with a stale lock. `cargo metadata` regenerates the one-line addition
  to kebab-cli's dependency list.
- tasks/p9/p9-fb-06-data-reset-command.md: status `in_progress` →
  `completed`, per the plan's task 6 commitment to flip in a separate
  one-line commit only after the implementation PR merges.

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

Cargo.lock

@@ -3523,6 +3523,7 @@ dependencies = [
  "kebab-eval",
  "kebab-tui",
  "serde_json",
+ "tempfile",
 ]
 
 [[package]]

tasks/p9/p9-fb-06-data-reset-command.md

@@ -3,7 +3,7 @@ phase: P9
 component: kebab-cli + kebab-app
 task_id: p9-fb-06
 title: "kebab reset / nuke command"
-status: in_progress
+status: completed
 depends_on: []
 unblocks: []
 contract_source: ../../docs/superpowers/specs/2026-04-27-kebab-final-form-design.md