iblai-vibe-billing

# /iblai-vibe-billing Add the tenant **Billing** surface -- "Manage your billing and subscription" for the whole workspace, in three tabs: **Plan & Credits** (current plan with Stripe upgrade, credit balance with its USD equivalent, Add Credits, and Auto Recharge with threshold / recharge amount / spending limit), **Spend Limits** (the single workspace-wide LLM spend limit covering everything all agents and users spend), and **Agent Limits** (every agent spend cap in the workspace in one searchable table — each row opens the same per-agent Billing editor documented in `/iblai-vibe-agent-billing`). This is the tenant-level counterpart of the per-agent Billing tab: per-agent and per-user limits live in each agent's settings (`/iblai-vibe-agent-billing`); this surface holds the plan/credits management, the workspace-wide cap, and the cross-agent overview.     ![Billing — Agen...