docs: add strategy AI modding review and recommendations

[Luis85]

Motivation

• Capture a focused repo review and external research (notably Anbeeld’s “designing AI for strategy games through modding”) and surface concrete repo issues and pragmatic recommendations around onboarding, performance gating, and runtime determinism baselines.

Description

• Add docs/specs/2026-05-06-strategy-ai-modding-review.md, a short spec containing research highlights, three prioritized findings (Quickstart pre-publish install mismatch, missing perf-regression gate in verify, and Node baseline clarity), recommended architecture patterns, and a near-term action plan.

Testing

• Ran npm run -s typecheck which completed successfully.
• Ran npm test which completed successfully (96 files, 682 tests passed).
• Note: invoking npm test -- --runInBand failed because the --runInBand flag is not supported by the configured Vitest runner (CLI flag error), not due to repository changes.

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Codex Task