Phase 4 of the security-polish series. The relay was expanded from 3
roles (pm + dev-a + dev-b) to 4 (adds dev-c) in dd0010d, but the
launcher script never followed — it still opened only 3 windows and
the manual-mode banner said "3 new terminals". Add DEV_C_PROMPT
discovery alongside the existing PM/Dev-A/Dev-B lines, and a fourth
window/tab/terminal in each of the three modes (manual / tmux / kitty)
plus the corresponding banner and summary-print updates.
The queue.test.ts assertion update part of P1.8 already shipped in
061facd — this commit closes the launcher half.
Refs: docs/superpowers/specs/2026-05-04-security-polish-design.md (Phase 4)
Refs: docs/superpowers/reviews/2026-05-04-architecture-review.md (P1.8)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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