fix(fleet): raise fleet-personas spec timeout

docs/scratchpads/672-fleet-personas-timeout.md

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+# Scratchpad — fleet-personas spec timeout
+
+## Objective
+
+Raise `packages/mosaic/src/commands/fleet-personas.spec.ts` Vitest timeout to 30s, mirroring PR #665's `fleet-provision.spec.ts` CI flake fix.
+
+## Plan
+
+1. Copy `vi.setConfig({ testTimeout: 30_000 })` pattern/placement from `fleet-provision.spec.ts`.
+2. Run targeted test plus typecheck/lint/format gates.
+3. Commit, queue guard, push, PR.
+
+## Evidence
+
+- `pnpm --filter @mosaicstack/mosaic test -- src/commands/fleet-personas.spec.ts` — pass (8 tests).
+- `pnpm typecheck` — pass (41 tasks).
+- `pnpm lint` — pass (23 tasks).
+- `pnpm format:check` — pass after formatting this scratchpad.