# Fleet enhancer role + two-agent floor (#614)

- **Issue:** #614 · **Branch:** `feat/fleet-enhancer-floor` (stacked on #612 `feat/fleet-polish-bundle`)
- **Doctrine:** `docs/fleet/north-star.md` (PR #613) — every fleet = orchestrator + enhancer minimum.

## Changes

- **Presets** (general, coding, research, hybrid): add `enhancer` (claude, `class: enhancer`,
  `persistent_persona: true`) as a core always-on agent alongside the orchestrator. minimal/local-canary
  unchanged.
- **fleet.ts**: `countEnhancers` helper; init guarantee extended — non-minimal profiles must yield
  exactly 1 orchestrator AND >=1 enhancer (hard-fail otherwise); `removeAgentFromRoster` refuses to drop
  the sole enhancer (symmetric with the sole-orchestrator guard) so the floor holds at runtime, not just init.
- **Role doc**: `framework/fleet/roles/enhancer.md` — the enhancer mandate (monitor → analyze → plan →
  upgrade tools/skills/harness WITH orchestrator → file Mosaic Stack bug reports) + boundaries (does NOT
  code or review).

## Verification

- 155 fleet tests green (new: countEnhancers; remove-sole-enhancer guard; remove-allows-when-another;
  init two-agent-floor; every-non-minimal-preset-has-enhancer; updated preset rosters). tsc/eslint/
  prettier/sanitize clean. TDD on the init guarantee + remove protection.

## Stacking

Built on #612's init-R5 code. PR shows #612 + enhancer until #612 merges; then rebase onto main → clean.