Fleet view footer advertises r:Run-new but no key handler implements it

[rz1989s]

Summary

The /fleet panel's fleet-view footer hint advertises r:Run-new, but pressing r in fleet browse mode does nothing — there is no key handler for it.

Repro

1. Open pi with the fleet extension, run /fleet, stay on the Fleet tab (browse mode)
2. Footer reads: r:Run-new │ s:Steer │ x:Stop │ o:Open-todo │ t:Tree │ tab:Lifecycle │ q:Quit
3. Press r — nothing happens (no task input, no notification)

Expected

Either (a) r opens the Run-new task input in fleet view (e.g. startRun() with the default agent or an agent picker), or (b) the footer omits r:Run-new — the P1 capability-aware rule says unavailable keys are omitted, not advertised (spec §5 P1: "unavailable keys omitted from the footer, not just rejected").

Evidence

• Footer source: VIEW_HINTS.fleet in src/panel/present.ts (introduced in 95edcf8, P1 Fleet presentation redesign: transcript run-cards + colorized widget/panel (3 surfaces, spec ready) #104 velocity bundle)
• Key handlers: src/panel/fleet-panel.ts has r branches for agents (startRun selected), backends (notify), runs (startResume), lifecycle (startLifecycleRun) — no fleet-view branch
• startRun(agentName) itself exists and works (used by agents view) — only the fleet-view binding is missing

Found while

P3 real-pi smoke (Task 6 acceptance, feat/104-fleet-presentation-p3 @ 6c66299). Pre-existing since P1 — not a P3 regression.