[Feature]: [P2] Seed occupants from imported TDT occupancy (96 vs 234 census)

Imported from the engineering backlog (_bmad-output/implementation-artifacts/backlog.md, story tdt-import-population-seed).
Priority P2 (do-first order) | Severity: med | Status: idea | Epic: SimTower parity | Type: feature-request | Recorded: 2026-07-08

Problem / motivation

Gated: needs a small spec. Owner question 2026-07-08 (real-tower import): pop 96 vs the save's 234. We import the persistent OCCUPANCY (offices tenanted, condos sold, hotel rooms booked) but NOT the save's live person roster (§6, 768 sims) or live satisfaction: those are a transient crowd snapshot in the original's sim-model (positions, destinations, states referencing original floor/elevator indices) that does not map cleanly onto our emergent crowd, and it churns within sim-minutes, so a person-by-person port is high-effort/low-fidelity (correctly deferred). The real symptom worth fixing is the HEADCOUNT: on load our tower re-populates the crowd from empty, so pop lags the save's number for a while (worse before the stairs fix, since upper floors were unreachable). Proposal: SEED the initial population/crowd from the imported occupancy (and optionally the save's per-floor population line in the finance block §9, which we already locate) so the headcount and initial fill match on load, WITHOUT importing individual sims. Verify against my_tower.TDT (target pop ~234). Distinct from named-tenant import (still deferred). Minor bump.

Start with _bmad-output/implementation-artifacts/backlog.md and the tdt-import-population-seed story, then trace the existing TDT occupancy import and the finance block §9 population line. Use my_tower.TDT as the reference case. Done means the initial crowd is seeded from imported occupancy, reaches roughly 234 occupants on load, and does not import individual transient sims or named tenants.