AI Observer Foundation Review & Polish (M9.1)

[Copilot]

Closes #19. Reviews and polishes the AI Observer implementation to meet M9.1 acceptance criteria for both local SimEngine and remote SimServiceClient modes.

Bug Fix

• Fixed _get_state() in observer.py to unwrap the data field from service responses when using SimServiceClient

Integration Tests

• Added 4 new tests for SimServiceClient mode covering tick observation, trend detection, commentary generation, and JSON output
• Refactored to use pytest fixture for proper client resource cleanup

Documentation

• Enhanced README with explicit local/remote mode examples:

# Remote SimServiceClient mode
from gengine.echoes.client import SimServiceClient
from gengine.ai_player import Observer, ObserverConfig

with SimServiceClient("http://localhost:8000") as client:
    observer = Observer(client=client, config=ObserverConfig(tick_budget=50))
    report = observer.observe()
    print(report.stability_trend.to_dict())

Tracker

• Updated .pm/tracker.md task 9.1.1 status to completed

Original prompt

"Issue #19 AI Observer review and polish" to gamedev agent

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