fix(company): bypass staffing for fully staffed teams

[myfastcat]

Skip staffing workflow for fully staffed teams

Issue

Company runs opened staffing selection, LLM triage, recruitment, and confirmation even when every role already had an active, non-placeholder employee assigned. This added unnecessary latency and prompted the user to approve staffing that was not changing.

Fix

• Detect when every role has existing, active, non-placeholder same-role staff.
• Reuse those employees without opening the staffing preflight or invoking recruiter triage.
• Do not require recruitment confirmation when an existing_staff proposal only reuses incumbents.
• Keep manual staffing available through force_manual_preflight.
• Continue through the normal staffing flow when a role is unstaffed or only has placeholder employees.

Tests

• Fully staffed teams bypass recruitment and confirmation.
• Manual staffing preflight remains available.
• Placeholder-only roles retain staffing preflight.
• existing_staff without an incumbent still requires confirmation.