feat: add agent awareness and private communications

[christopherjnelson]

Summary

• add the text-flat-json-v2 communication contract and durable-influence-v2 objective
• replace H3-ring direct-message eligibility with scenario-owned physical distance, defaulting to 12 km
• add bounded nearby awareness, long-range alliance awareness, deterministic move affordances, and recent movement memory
• add private alliance communication plus the World Lab operator-only Private comms feed
• centralize neutral unaffiliated coloring and preserve individual ownership identity
• extend safe telemetry and exports for communication, alliance, awareness, and movement behavior
• document the current sequential-turn privacy model and future capture-alert boundary

Impact

Agents can deliberately coordinate, negotiate, compete, and vary movement using authoritative spatial context. Public messages are explicitly future-player-visible, while direct and alliance messages remain player-hidden. World Lab operators can inspect bounded private traffic without exposing it through future player-facing contracts.

Validation

• pnpm validate
• pnpm test:e2e

Both commands pass locally. The Playwright journey uses only the deterministic provider and local test servers; no live OpenRouter or geocoding calls were made.