fix(setup): inject statusline footer last so it can't silently miss

[pacphi]

Problem

ak setup (project scope) ran fixStatusline at step 2, right after ruflo init. But fixStatusline early-returns applied:false when .claude/helpers/statusline.cjs isn't settled yet (statusline.mjs:23), and setup logged that outcome as info, not a warning (setup.mjs:104).

Result: on a real repo, the footer injection silently no-op'd, so the statusline rendered without the Agentic QE / SONA segments — and nobody was told. Only the reactive net (ak sync detecting "footer missing") healed it later; setup itself never converged.

Root cause (verified, not assumed)

• Reproduced that aqe init --auto (step 9) preserves an already-injected footer — so nothing was clobbering it. Step 2 simply missed a not-yet-settled helper file.
• Confirmed fixStatusline is idempotent and injects cleanly once the helper exists.

Fix

• Move the statusline heal to the final project step (step 10), after both ruflo init and aqe init have written the helper.
• A still-missing footer is now a warn pointing at ak sync, never silent info.

Verification

• node --check src/commands/setup.mjs passes
• node tests/statusline-segments.test.cjs → 20 passed, 0 failed
• Applied the equivalent heal to a live repo via ak sync; the 🎓 Agentic QE segment now renders