Add Wildfire encounters and six-offering ritual progression

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Summary

• add Stage 2+ Wildfire roaming miniboss encounters with Blaze escorts, mobile combat, deep-lava recovery, rendering, rewards, and focused behavior coverage
• replace the four-element ritual model with six identity-based offerings while gating unwanted vanilla acquisition sources
• align faction targeting, fire interactions, AI ownership and performance documentation with the new encounter and progression behavior

Validation

• bash ./gradlew build
• retold:wildfire_blaze_escorts_follow_into_combat
• retold:wildfire_patrols_with_single_file_blaze_escort
• focused Wildfire spawning, targeting, recovery, and performance selectors documented in the included testing records

Risks and manual checks

• Wildfire model, brightness, eye placement, scale, and encounter feel still benefit from visual in-game testing
• no multiplayer-specific behavior was changed beyond server-authoritative shared systems covered by existing tests

AI assistance

Implemented and validated with Codex assistance under the repository agent guidelines.