Implements quota enforcement for agents including daily token limits,
daily job limits, concurrent job caps, model allowlists, and global
per-model budgets. Quota recovery returns 50% for failed jobs and
100% for cancelled jobs.
Go: AllowanceService with MemoryStore, AllowanceStore interface, and
25 tests covering all enforcement paths.
Laravel: migration for 5 tables (agent_allowances, quota_usage,
model_quotas, usage_reports, repo_limits), Eloquent models,
AllowanceService, QuotaMiddleware, and REST API routes.
Closes#99
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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